Abstract
This letter gives an example of how Källén would communicate with those who sent him their preprints. It is particularly appropriate to reproduce it here as it concerns the constant M. Note that Källén uses the Pauli metric, with indices running from one to four.
On 25 January 1960 Källén writes a letter to K. Nishijima at Urbana, Illinois, which reads as follows:
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© 2014 Springer International Publishing Switzerland
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Jarlskog, C. (2014). Letter to K. Nishijima. In: Jarlskog, C. (eds) Portrait of Gunnar Källén. Springer, Cham. https://doi.org/10.1007/978-3-319-00627-7_21
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DOI: https://doi.org/10.1007/978-3-319-00627-7_21
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