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The reference is pretty advanced; it would be good to replace it (or supplement it) with a more elementary reference, if any exists. — Toby Bartels ( talk) 04:25, 12 February 2008 (UTC) reply

In the definition we have

" the sequence (f(x₁), f(x₂), …) is a Cauchy sequence in Y "

but the definition of a Cauchy sequence is not given (nor linked). Nico.v.44 ( talk) 14:31, 11 August 2021 (UTC) reply