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fix p_is_p' #123

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Sep 9, 2024
Merged

fix p_is_p' #123

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2 changes: 1 addition & 1 deletion FLT/mathlibExperiments/Frobenius.lean
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Original file line number Diff line number Diff line change
Expand Up @@ -403,7 +403,7 @@ lemma q_is_p'_pow_n : p' ^ n = q :=

lemma p_is_p' : p = p' := by
-- `q = 0` in `A⧸ P` and `p | q` since `CharP p` then since `q = p' ^ n` then `p' = p`
have eq0 : (q : A⧸ P) = 0 := sorry--CharP.cast_card_eq_zero (A ⧸ P) -- mathlib bump broke this
have eq0 : (q : A⧸ P) = 0 := Nat.cast_card_eq_zero (A ⧸ P)
have h1 : p ∣ q := charP_iff (A ⧸ P) p |>.1 (p_is_char P) q |>.1 eq0
have eq1 : p' ^ n = q := q_is_p'_pow_n P
rw [← eq1] at h1
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