mathlib

2b3cffd3 - feat(algebra/floor): notation for nat_floor and nat_ceil (#8526)

feat(algebra/floor): notation for nat_floor and nat_ceil (#8526) We introduce the notations ` ⌊a⌋₊` for `nat_floor a` and `⌈a⌉₊` for `nat_ceil a`, mimicking the existing notations for `floor` and `ceil` (with the `+` corresponding to the recent notation for `nnnorm`).