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[Merged by Bors] - refactor(data/fin,*): redefine insert_nth
, add lemmas
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### `data/fin` * add `fin.succ_above_cast_lt`, `fin.succ_above_pred`, `fin.cast_lt_succ_above`, `fin.pred_succ_above`; * add `fin.exists_succ_above_eq` and `fin.exists_succ_above_eq_iff`, use the latter to prove `fin.range_succ_above`; * add `@[simp]` to `fin.succ_above_left_inj`; * add `fin.cases_succ_above` induction principle, redefine `fin.insert_nth` to be `fin.cases_succ_above`; * add lemmas about `fin.insert_nth` and some algebraic operations. ### `data/fintype/basic` * add `finset.insert_compl_self`; * add `fin.image_succ_above_univ`, `fin.image_succ_univ`, `fin.image_cast_succ` and use them to prove `fin.univ_succ`, `fin.univ_cast_succ`, and `fin.univ_succ_above` using `by simp`; ### `data/fintype/card` * slightly golf the proof of `fin.prod_univ_succ_above`; * use `@[to_additive]` to generate some proofs. ### `topology/*` * prove continuity of `fin.insert_nth` in both arguments and add all the standard dot-notation `*.fin_insert_nth` lemmas (`*` is one of `filter.tendsto`, `continuous_at`, `continuous_within_at`, `continuous_on`, `continuous`).
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refactor(data/fin,*): redefine
[Merged by Bors] - refactor(data/fin,*): redefine Sep 26, 2021
insert_nth
, add lemmasinsert_nth
, add lemmas
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data/fin
fin.succ_above_cast_lt
,fin.succ_above_pred
,fin.cast_lt_succ_above
,fin.pred_succ_above
;fin.exists_succ_above_eq
andfin.exists_succ_above_eq_iff
,use the latter to prove
fin.range_succ_above
;@[simp]
tofin.succ_above_left_inj
;fin.cases_succ_above
induction principle, redefinefin.insert_nth
to befin.cases_succ_above
;fin.insert_nth
and some algebraic operations.data/fintype/basic
finset.insert_compl_self
;fin.image_succ_above_univ
,fin.image_succ_univ
,fin.image_cast_succ
and use them to provefin.univ_succ
,fin.univ_cast_succ
, andfin.univ_succ_above
usingby simp
;data/fintype/card
fin.prod_univ_succ_above
;@[to_additive]
to generate some proofs.topology/*
fin.insert_nth
in both arguments and add allthe standard dot-notation
*.fin_insert_nth
lemmas (*
is one offilter.tendsto
,continuous_at
,continuous_within_at
,continuous_on
,continuous
).