Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-10-05 07:39 565e961d

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feat(number_theory/arithmetic_function): Define arithmetic functions/the Dirichlet ring (#4352) Defines a type arithmetic_function A of functions from nat to A sending 0 to 0 Defines the Dirichlet ring structure on arithmetic_function A

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