[isabelle] Executing real numbers as approximating functions



Hi all,

once I have heard about a formalisation to execute real numbers as
approximating functions, i.e. where each real number r is implemented
using a function

  R :: nat => float

such that R n equals r approximated to the n-th digit (or something
similar).

Can somebody give me a reference for that?

Thanks a lot,
	Florian

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