mathlib

b7d980c5 - feat(topology/algebra/weak_dual_topology + analysis/normed_space/weak_dual_of_normed_space): add definition and first lemmas about weak-star topology (#8598)

feat(topology/algebra/weak_dual_topology + analysis/normed_space/weak_dual_of_normed_space): add definition and first lemmas about weak-star topology (#8598) Add definition and first lemmas about weak-star topology. Co-authored-by: kkytola <39528102+kkytola@users.noreply.github.com>