Abstract
1. What is Approximation Theory? What is the subject of its research? How do we sketch the shape of a mathematical discipline? To respond to these questions is not easy since very different opinions on this score are possible.
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Tikkomirov, V.M. (1990). Approximation Theory. In: Gamkrelidze, R.V. (eds) Analysis II. Encyclopaedia of Mathematical Sciences, vol 14. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-61267-1_2
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