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2 changes: 1 addition & 1 deletion MIL/C02_Basics/S03_Using_Theorems_and_Lemmas.lean
Original file line number Diff line number Diff line change
Expand Up @@ -377,7 +377,7 @@ example : 2*a*b ≤ a^2 + b^2 := by
How nice! We challenge you to use these ideas to prove the
following theorem. You can use the theorem ``abs_le'.mpr``.
You will also need the ``constructor`` tactic to split a conjunction
to two goals; see :numref:`conjunction_and_biimplication`.
into two goals; see :numref:`conjunction_and_biimplication`.
TEXT. -/
-- QUOTE:
example : |a*b| ≤ (a^2 + b^2)/2 := by
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