2a67a49f31
This PR deprecates the tactics `simp_arith`, `simp_arith!`, `simp_all_arith` and `simp_all_arith!`. Users can just use the `+arith` option.
13 lines
486 B
Text
13 lines
486 B
Text
@[simp] theorem get_cons_zero {as : List α} : (a :: as).get (0 : Fin (as.length + 1)) = a := rfl
|
||
|
||
example (a b c : α) : [a, b, c].get ⟨0, by simp (config := { decide := true })⟩ = a := by
|
||
simp
|
||
|
||
example (a : Bool) : (a :: as).get ⟨0, by simp +arith⟩ = a := by
|
||
simp
|
||
|
||
example (a : Bool) : (a :: as).get ⟨0, by simp +arith⟩ = a := by
|
||
simp
|
||
|
||
example (a b c : α) : [a, b, c].get ⟨0, by simp (config := { decide := true })⟩ = a := by
|
||
rw [Fin.zero_eta, get_cons_zero]
|