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Proof step 12 from proof middle-coef-largest (previous step)

2 * j - j = j, binom_coef(2 * j, j) < binom_coef(2 * j, 2 * j - j), 0 ≤ j ⊦

User applied rule insert equation

And closed the goal!

Rule argument

pos: left 1 flags: discard

Additional information

Used simplifier rules: irreflexivity: ⊦ ¬ i < i; from specification oelem[intlista]