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A new method with improved phase-lag and stability properties for problems in quantum chemistry - an economical case

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Abstract

A new FINDIFF (Finite Difference) method with zeroing phase-lag and its derivatives up to order two, for initial or boundary value problems with periodical and/or oscillating solutions with an application on problems in Quantum Chemistry, is proposed in this paper. The method is considered to belong to the economical class of methods since it is of the highest possible algebraic order using the minimum number of function evaluations per step.

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Appendix

Appendix

$$\begin{aligned}LTE_{CL}= & {} LTE_{NM142S4SPD1} = LTE_{NM142S4SPD2} \approx \\\approx & {} h^{16} \, \ell _{0} = h^{16} \, \left[ {\frac{25387\, \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) \upsilon \left( x \right) \, EXPR_{1}}{128296396800}}\right. \\&+{\frac{2491\, \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) \upsilon \left( x \right) \left( {\frac{\mathrm{d}^{5}}{\mathrm{d}{x}^{5}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{4}}{\mathrm{d}{x}^{4}}}PTN \left( x \right) }{9542707200}}\\&+ {\frac{16271\, \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) \upsilon \left( x \right) \left( {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \right) ^{2}{\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) }{15395567616}}\\&+ {\frac{169441\, \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) ^{2} \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \left( {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) }{144333446400}}\\&+ {\frac{371\, \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) {\frac{\mathrm{d}^{10}}{\mathrm{d}{x}^{10}}}PTN \left( x \right) }{104969779200}} \end{aligned}$$
$$\begin{aligned}&+ {\frac{1007\, \left( {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) {\frac{\mathrm{d}^{9}}{\mathrm{d}{x}^{9}}}PTN \left( x \right) }{88820582400}}\\&+ {\frac{53\, \left( {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \right) \upsilon \left( x \right) {\frac{\mathrm{d}^{10}}{\mathrm{d}{x}^{10}}}PTN \left( x \right) }{29606860800}}\\&+ {\frac{53\, \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) \upsilon \left( x \right) {\frac{\mathrm{d}^{11}}{\mathrm{d}{x}^{11}}}PTN \left( x \right) }{85530931200}}\\&+ {\frac{39167\, \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) ^{4}\upsilon \left( x \right) {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) }{288666892800}}\\&+ {\frac{522739\, \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) ^{2}\upsilon \left( x \right) \left( {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) \right) ^{2}}{1154667571200}}\\&+ {\frac{8533\, \left( {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \right) \upsilon \left( x \right) \left( {\frac{\mathrm{d}^{4}}{\mathrm{d}{x}^{4}}}PTN \left( x \right) \right) ^{2}}{44410291200}}\\&+ {\frac{4823\, \left( {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) \right) ^{2}\upsilon \left( x \right) {\frac{\mathrm{d}^{4}}{\mathrm{d}{x}^{4}}}PTN \left( x \right) }{22205145600}}\\&+ {\frac{624181\, \left( PTN \left( x \right) \right) ^{2}\upsilon \left( x \right) \left( {\frac{\mathrm{d}^{4}}{\mathrm{d}{x}^{4}}}PTN \left( x \right) \right) ^{2}}{4041336499200}}\\&+ {\frac{53\, \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \left( {\frac{\mathrm{d}^{4}}{\mathrm{d}{x}^{4}}}PTN \left( x \right) \right) ^{2}}{159045120}} \end{aligned}$$
$$\begin{aligned} &+ {\frac{1641569\, \left( PTN \left( x \right) \right) ^{2}\upsilon \left( x \right) \left( {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \right) ^{3}}{8082672998400}}\\&+ {\frac{23479\, \left( PTN \left( x \right) \right) ^{3}\upsilon \left( x \right) {\frac{\mathrm{d}^{8}}{\mathrm{d}{x}^{8}}}PTN \left( x \right) }{4041336499200}}\\&+ {\frac{1219\,PTN \left( x \right) \upsilon \left( x \right) {\frac{\mathrm{d}^{12}}{\mathrm{d}{x}^{12}}}PTN \left( x \right) }{8082672998400}}\\&+ {\frac{48707\, \left( PTN \left( x \right) \right) ^{3}\upsilon \left( x \right) \left( {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) \right) ^{2}}{505167062400}}\\&+ {\frac{4717\, \left( PTN \left( x \right) \right) ^{2}\upsilon \left( x \right) {\frac{\mathrm{d}^{10}}{\mathrm{d}{x}^{10}}}PTN \left( x \right) }{2694224332800}}\\&+ {\frac{16589\, \left( PTN \left( x \right) \right) ^{4}\upsilon \left( x \right) \left( {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \right) ^{2}}{769778380800}}\\&+ {\frac{53\, \left( PTN \left( x \right) \right) ^{6}\upsilon \left( x \right) {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) }{128296396800}}\\&+ {\frac{110399\, \left( PTN \left( x \right) \right) ^{4}\upsilon \left( x \right) {\frac{\mathrm{d}^{6}}{\mathrm{d}{x}^{6}}}PTN \left( x \right) }{16165345996800}}\\&+ {\frac{53\, \left( PTN \left( x \right) \right) ^{5}\upsilon \left( x \right) {\frac{\mathrm{d}^{4}}{\mathrm{d}{x}^{4}}}PTN \left( x \right) }{18041680800}}\\&+ {\frac{2491\,PTN \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) {\frac{\mathrm{d}^{11}}{\mathrm{d}{x}^{11}}}PTN \left( x \right) }{4041336499200}}\\&+ {\frac{901\, \left( PTN \left( x \right) \right) ^{3} \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) {\frac{\mathrm{d}^{7}}{\mathrm{d}{x}^{7}}}PTN \left( x \right) }{126291765600}}\\&+ {\frac{2334809\,PTN \left( x \right) \upsilon \left( x \right) \left( {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) \right) \, EXPR_{2}}{2020668249600}}\\&+ {\frac{53\, \left( {\frac{\mathrm{d}^{14}}{\mathrm{d}{x}^{14}}}PTN \left( x \right) \right) \upsilon \left( x \right) }{32330691993600}}\\&+ {\frac{53\, \left( {\frac{\mathrm{d}^{13}}{\mathrm{d}{x}^{13}}}PTN \left( x \right) \right) {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) }{2309335142400}}\\&+ {\frac{53\, \left( PTN \left( x \right) \right) ^{8}\upsilon \left( x \right) }{32330691993600}}\end{aligned}$$
$$\begin{aligned}&+ {\frac{53\, \left( PTN \left( x \right) \right) ^{6} \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) }{577333785600}}\\&+ {\frac{371\, \left( PTN \left( x \right) \right) ^{3} \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) ^{3}}{28866689280}}\\&+ {\frac{1007\, \left( PTN \left( x \right) \right) ^{5}\upsilon \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) ^{2}}{577333785600}}\\&+ {\frac{2173\, \left( PTN \left( x \right) \right) ^{2}\upsilon \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) ^{4}}{57733378560}}\\&+ {\frac{53\, \left( {\frac{\mathrm{d}^{5}}{\mathrm{d}{x}^{5}}}PTN \left( x \right) \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) {\frac{\mathrm{d}^{6}}{\mathrm{d}{x}^{6}}}PTN \left( x \right) }{1009324800}}\\&+ {\frac{2491\, \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) ^{2}\upsilon \left( x \right) {\frac{\mathrm{d}^{8}}{\mathrm{d}{x}^{8}}}PTN \left( x \right) }{104969779200}}\\&+ {\frac{371\, \left( {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) {\frac{\mathrm{d}^{8}}{\mathrm{d}{x}^{8}}}PTN \left( x \right) }{14803430400}}\\&+ {\frac{689\, \left( {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) \right) \upsilon \left( x \right) {\frac{\mathrm{d}^{9}}{\mathrm{d}{x}^{9}}}PTN \left( x \right) }{177641164800}}\\&+ {\frac{53\, \left( {\frac{\mathrm{d}^{4}}{\mathrm{d}{x}^{4}}}PTN \left( x \right) \right) \upsilon \left( x \right) {\frac{\mathrm{d}^{8}}{\mathrm{d}{x}^{8}}}PTN \left( x \right) }{8074598400}}\\&+ {\frac{1007\, \left( {\frac{\mathrm{d}^{5}}{\mathrm{d}{x}^{5}}}PTN \left( x \right) \right) \upsilon \left( x \right) {\frac{\mathrm{d}^{7}}{\mathrm{d}{x}^{7}}}PTN \left( x \right) }{113044377600}}\\&+ {\frac{7897\, \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) ^{3}\upsilon \left( x \right) {\frac{\mathrm{d}^{5}}{\mathrm{d}{x}^{5}}}PTN \left( x \right) }{52484889600}}\\&+ {\frac{265\, \left( {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \right) ^{2}\upsilon \left( x \right) {\frac{\mathrm{d}^{6}}{\mathrm{d}{x}^{6}}}PTN \left( x \right) }{2368548864}}\\&+ {\frac{53\, \left( {\frac{\mathrm{d}^{6}}{\mathrm{d}{x}^{6}}}PTN \left( x \right) \right) ^{2}\upsilon \left( x \right) }{10766131200}}\\&+ {\frac{53\, \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) ^{5}{\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) }{2624244480}} \end{aligned}$$
$$\begin{aligned}&+ {\frac{371\, \left( {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) \right) ^{3}{\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) }{1850428800}}\\&+ {\frac{53\, \left( {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \right) ^{4}\upsilon \left( x \right) }{526344192}}\\&+ {\frac{31747\, \left( PTN \left( x \right) \right) ^{3}\upsilon \left( x \right) \left( {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{4}}{\mathrm{d}{x}^{4}}}PTN \left( x \right) }{202066824960}}\\&+ {\frac{3551\, \left( {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \right) ^{2} \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) {\frac{\mathrm{d}^{5}}{\mathrm{d}{x}^{5}}}PTN \left( x \right) }{9868953600}}\\&+ {\frac{35351\, \left( PTN \left( x \right) \right) ^{2} \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \, EXPR_{3}}{192444595200}}\\&+ {\frac{53\, \left( {\frac{\mathrm{d}^{4}}{\mathrm{d}{x}^{4}}}PTN \left( x \right) \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) {\frac{\mathrm{d}^{7}}{\mathrm{d}{x}^{7}}}PTN \left( x \right) }{1284595200}}\\&+ {\frac{265\, \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) ^{3} \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) {\frac{\mathrm{d}^{4}}{\mathrm{d}{x}^{4}}}PTN \left( x \right) }{1049697792}}\\&+ {\frac{26977\, \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) ^{2} \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) {\frac{\mathrm{d}^{7}}{\mathrm{d}{x}^{7}}}PTN \left( x \right) }{367394227200}}\\&+ {\frac{168169\, \left( PTN \left( x \right) \right) ^{3}\upsilon \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{5}}{\mathrm{d}{x}^{5}}}PTN \left( x \right) }{2020668249600}}\\&+ {\frac{54007\,PTN \left( x \right) \upsilon \left( x \right) \left( {\frac{\mathrm{d}^{5}}{\mathrm{d}{x}^{5}}}PTN \left( x \right) \right) ^{2}}{734788454400}}\\&+ {\frac{1961\, \left( PTN \left( x \right) \right) ^{4} \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) {\frac{\mathrm{d}^{5}}{\mathrm{d}{x}^{5}}}PTN \left( x \right) }{384889190400}}\\&+ {\frac{53\, \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \left( {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \right) ^{3}}{106913664}}\\&+ {\frac{1643\, \left( PTN \left( x \right) \right) ^{2} \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) {\frac{\mathrm{d}^{9}}{\mathrm{d}{x}^{9}}}PTN \left( x \right) }{449037388800}} \end{aligned}$$
$$\begin{aligned}&+ {\frac{371\, \left( PTN \left( x \right) \right) ^{5} \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) }{288666892800}}\\&+ {\frac{53\, \left( PTN \left( x \right) \right) ^{2} \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \left( {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{4}}{\mathrm{d}{x}^{4}}}PTN \left( x \right) }{198806400}}\\&+ {\frac{5671\,PTN \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \left( {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) \right) ^{2}{\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) }{9020840400}}\\&+ {\frac{8851\,PTN \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) ^{2}{\frac{\mathrm{d}^{5}}{\mathrm{d}{x}^{5}}}PTN \left( x \right) }{32074099200}}\\&+ {\frac{61427\,PTN \left( x \right) \upsilon \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) ^{2}{\frac{\mathrm{d}^{6}}{\mathrm{d}{x}^{6}}}PTN \left( x \right) }{310872038400}}\\&+ {\frac{2809\, \left( PTN \left( x \right) \right) ^{3} \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \left( {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) }{28866689280}}\\&+ {\frac{2173\, \left( PTN \left( x \right) \right) ^{3} \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{4}}{\mathrm{d}{x}^{4}}}PTN \left( x \right) }{36083361600}}\\&+ {\frac{11183\, \left( {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \, EXPR_{4}}{11102572800}}\\&+ {\frac{67363\, \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \, EXPR_{5}}{192444595200}}\\&+ {\frac{622697\, \left( PTN \left( x \right) \right) ^{2}\upsilon \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) ^{2}{\frac{\mathrm{d}^{4}}{\mathrm{d}{x}^{4}}}PTN \left( x \right) }{2020668249600}}\\&+ {\frac{793781\,PTN \left( x \right) \upsilon \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) ^{3}{\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) }{2020668249600}} \end{aligned}$$
$$\begin{aligned} &+ {\frac{63017\, \left( PTN \left( x \right) \right) ^{2} \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) ^{2}{\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) }{288666892800}}\\&+ {\frac{11819\,PTN \left( x \right) \upsilon \left( x \right) \left( {\frac{\mathrm{d}^{6}}{\mathrm{d}{x}^{6}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{4}}{\mathrm{d}{x}^{4}}}PTN \left( x \right) }{91848556800}}\\&+ {\frac{20087\,PTN \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) ^{3}{\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) }{72166723200}}\\&+ {\frac{2491\,PTN \left( x \right) \upsilon \left( x \right) \left( {\frac{\mathrm{d}^{9}}{\mathrm{d}{x}^{9}}}PTN \left( x \right) \right) {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) }{168389020800}}\\&+ {\frac{170713\,PTN \left( x \right) \upsilon \left( x \right) \left( {\frac{\mathrm{d}^{8}}{\mathrm{d}{x}^{8}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) }{4041336499200}}\\&+ {\frac{346037\,PTN \left( x \right) \upsilon \left( x \right) \left( {\frac{\mathrm{d}^{7}}{\mathrm{d}{x}^{7}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) }{4041336499200}}\\&+ {\frac{26129\,PTN \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \left( {\frac{\mathrm{d}^{6}}{\mathrm{d}{x}^{6}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) }{144333446400}}\\&+ {\frac{583\,PTN \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \left( {\frac{\mathrm{d}^{5}}{\mathrm{d}{x}^{5}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{4}}{\mathrm{d}{x}^{4}}}PTN \left( x \right) }{2385676800}}\\&+ {\frac{65243\,PTN \left( x \right) \upsilon \left( x \right) \left( {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \right) ^{2}{\frac{\mathrm{d}^{4}}{\mathrm{d}{x}^{4}}}PTN \left( x \right) }{91848556800}}\\&+ {\frac{23797\,PTN \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \left( {\frac{\mathrm{d}^{8}}{\mathrm{d}{x}^{8}}}PTN \left( x \right) \right) {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) }{673556083200}}\\&+ {\frac{97997\,PTN \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \left( {\frac{\mathrm{d}^{7}}{\mathrm{d}{x}^{7}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) }{1010334124800}}\\&+ {\frac{14893\, \left( PTN \left( x \right) \right) ^{2} \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) \left( {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \right) ^{2}}{52484889600}}\end{aligned}$$
$$\begin{aligned}&+ {\frac{33443\, \left( PTN \left( x \right) \right) ^{3}\upsilon \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) ^{2}{\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) }{288666892800}}\\&+ {\frac{371\, \left( PTN \left( x \right) \right) ^{4} \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) }{28866689280}}\\&+ {\frac{38213\, \left( PTN \left( x \right) \right) ^{4}\upsilon \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) }{1154667571200}}\\&+ {\frac{176543\, \left( PTN \left( x \right) \right) ^{2}\upsilon \left( x \right) \left( {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{5}}{\mathrm{d}{x}^{5}}}PTN \left( x \right) }{673556083200}}\\&+ {\frac{1277989\, \left( PTN \left( x \right) \right) ^{2}\upsilon \left( x \right) \left( {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{6}}{\mathrm{d}{x}^{6}}}PTN \left( x \right) }{8082672998400}}\\&+ {\frac{87821\, \left( PTN \left( x \right) \right) ^{2}\upsilon \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{7}}{\mathrm{d}{x}^{7}}}PTN \left( x \right) }{1347112166400}}\\&+ {\frac{232511\,PTN \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \left( {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \right) ^{2}{\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) }{288666892800}}\\&+ {\frac{6307\,PTN \left( x \right) \upsilon \left( x \right) \left( {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \right) \left( {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) \right) ^{2}}{7401715200}}\\&+ {\frac{270883\,PTN \left( x \right) \upsilon \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) ^{2} \left( {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \right) ^{2}}{367394227200}} \end{aligned}$$
$$\begin{aligned} &+ {\frac{5353\, \left( PTN \left( x \right) \right) ^{2} \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{6}}{\mathrm{d}{x}^{6}}}PTN \left( x \right) }{64148198400}}\\&+ {\frac{298867\, \left( PTN \left( x \right) \right) ^{2}\upsilon \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) \, EXPR_{6}}{310872038400}}\\&+ {\frac{438787\, \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) ^{2}\upsilon \left( x \right) \left( {\frac{\mathrm{d}^{4}}{\mathrm{d}{x}^{4}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) }{577333785600}}\\&+ {\frac{65773\,PTN \left( x \right) \upsilon \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) \, EXPR_{7}}{80826729984}}\\&+ {\frac{29839\, \left( {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \right) \upsilon \left( x \right) \left( {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{5}}{\mathrm{d}{x}^{5}}}PTN \left( x \right) }{88820582400}}\\&+ {\frac{148771\,PTN \left( x \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) \, EXPR_{8}}{144333446400}}\\&+ {\frac{164353\, \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) \left( {\frac{\mathrm{d}}{\mathrm{d}x}}\upsilon \left( x \right) \right) \left( {\frac{\mathrm{d}^{5}}{\mathrm{d}{x}^{5}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) }{288666892800}}\\&+ \left. {\frac{12137\, \left( {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) \right) \upsilon \left( x \right) \left( {\frac{\mathrm{d}^{7}}{\mathrm{d}{x}^{7}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) }{107768973312}} \right] \end{aligned}$$

where

$$\begin{aligned} \upsilon \left( x \right)= & {} \upsilon _{n}, \\ EXPR_{1}= & {} \left( {\frac{\mathrm{d}^{6}}{\mathrm{d}{x}^{6}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) , \\ EXPR_{2}= & {} \left( {\frac{\mathrm{d}^{4}}{\mathrm{d}{x}^{4}}}PTN \left( x \right) \right) {\frac{\mathrm{d}}{\mathrm{d}x}}PTN \left( x \right) , \\ EXPR_{3}= & {} \left( {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{5}}{\mathrm{d}{x}^{5}}}PTN \left( x \right) , \\ EXPR_{4}= & {} \left( {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{4}}{\mathrm{d}{x}^{4}}}PTN \left( x \right) , \\ EXPR_{5}= & {} \left( {\frac{\mathrm{d}^{6}}{\mathrm{d}{x}^{6}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) , \\ EXPR_{6}= & {} \left( {\frac{\mathrm{d}^{3}}{\mathrm{d}{x}^{3}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) , \\ EXPR_{7}= & {} \left( {\frac{\mathrm{d}^{5}}{\mathrm{d}{x}^{5}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) , \\ EXPR_{8}= & {} \left( {\frac{\mathrm{d}^{4}}{\mathrm{d}{x}^{4}}}PTN \left( x \right) \right) {\frac{\mathrm{d}^{2}}{\mathrm{d}{x}^{2}}}PTN \left( x \right) \end{aligned}$$

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Li, X., Lin, CL. & Simos, T.E. A new method with improved phase-lag and stability properties for problems in quantum chemistry - an economical case. J Math Chem 59, 1571–1602 (2021). https://doi.org/10.1007/s10910-021-01245-3

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