Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-10-08 15:40 9b0d30c0

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feat(number_theory/arithmetic_function): define is_multiplicative on arithmetic_functions, provides examples (#4312) Provides a few basic examples of important arithmetic functions Defines what it means for an arithmetic function to be multiplicative

Estimated changes

modified theorem nat.arithmetic_function.ext
modified structure nat.arithmetic_function