mathlib

531bcd8d - feat(data/real/{nnreal,ennreal}, topology/instances/ennreal): add of_real_(sum/prod/tsum) for nnreal and ennreal (#5896)

feat(data/real/{nnreal,ennreal}, topology/instances/ennreal): add of_real_(sum/prod/tsum) for nnreal and ennreal (#5896) We remark that if all terms of a real sum are nonnegative, `nnreal.of_real` of the sum is equal to the sum of the `nnreal.of_real`. Idem for `ennreal.of_real`, for products and `tsum`.