mathlib

45c22c0d - feat(field_theory/is_alg_closed/basic): add `is_alg_closed.infinite` (#12566)

feat(field_theory/is_alg_closed/basic): add `is_alg_closed.infinite` (#12566) An algebraically closed field is infinite, because if it is finite then `x^(n+1) - 1` is a separable polynomial (where `n` is the cardinality of the field). Co-authored-by: jlh <48520973+Jlh18@users.noreply.github.com>