tomathlib/even-equiv-nat#46
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- Created ToMathlib/EvenEquivNat/Basic.lean with the equivalence and theorem
- Added metadata.yaml tracking this as to_submit status
- Removed code from MulticolorRamsey/Basic.lean and imported from ToMathlib
- Provides equivalence between {n : ℕ // Even n} and ℕ via n ↦ n/2
- Theorem: ∑' x, f (2*x) = ∑' x : {n | Even n}, f x
FordUniver
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