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- A mathematician is a person who can find analogies between theorems; a better mathematician is one who can see analogies between proofs and the best mathematician can notice analogies between theories. One can imagine that the ultimate mathematician is one who can see analogies between analogies.
- Beata Randrianantoanina; Narcisse Randrianantoanina (2007). Banach Spaces and Their Applications in Analysis: Proceedings of the International Conference at Miami University, May 22-27, 2006, in Honor of Nigel Kalton's 60th Birthday. Walter de Gruyter. p. 5. ISBN 978-3-11-019449-4.