The essence of mathematics is proving theorems — and so, that is what mathematicians do: They prove theorems. But to tell the truth, what they really want to prove, once in their lifetime, is a Lemma, like the one by Fatou in analysis, the Lemma of Gauss in number theory, or the Burnside– Frobenius Lemma in combinatorics.
CITATION STYLE
Aigner, M., & Ziegler, G. M. (2018). Lattice paths and determinants. In Proofs from THE BOOK (pp. 229–234). Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-662-57265-8_32
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