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Fix misleading comment in tactics2, add and_map exercise #2

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Merged
SamuelSchlesinger merged 1 commit into from
Apr 2, 2026
Merged

Fix misleading comment in tactics2, add and_map exercise #2

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6 changes: 6 additions & 0 deletions .solutions/10_tactics/tactics2.lean
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Expand Up @@ -11,3 +11,9 @@ theorem and_swap (P Q : Prop) (h : P ∧ Q) : Q ∧ P := by
constructor
· exact h.right
· exact h.left

theorem and_map (P Q R : Prop) (h : P ∧ Q) (f : Q → R) : P ∧ R := by
constructor
· exact h.left
· apply f
exact h.right
6 changes: 5 additions & 1 deletion exercises/10_tactics/tactics2.lean
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Expand Up @@ -20,6 +20,10 @@ theorem and_intro (P Q : Prop) (hp : P) (hq : Q) : P ∧ Q := by
-- For the next theorem, you can access parts of `h : P ∧ Q`
-- using `h.left` (or `h.1`) and `h.right` (or `h.2`).

-- Combine constructor and apply
-- Use constructor and the .left/.right accessors together
theorem and_swap (P Q : Prop) (h : P ∧ Q) : Q ∧ P := by
sorry

-- Combine constructor and apply
theorem and_map (P Q R : Prop) (h : P ∧ Q) (f : Q → R) : P ∧ R := by
sorry
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