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Proof step 109 from proof byte-law-righthift-not (previous step)

i2b(bits2uint(firstn(8, (((((((false ' + true ') + false ') + false ') + false ') + false ') + false ') + false ') + false '))) = i2b(2147483392 + bits2uint(true ' + firstn(7, true ' + false ' + false ' + false ' + false ' + false ' + false ' + false '))) ⊦

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

seq: ⊦ n ≠ 0 → firstn(n, boolvar ' + bits) = boolvar ' + firstn(n -1, bits) subst: [bits, boolvar, n] → [ true ' + false ' + false ' + false ' + false ' + false ' + false ' + false ', false, 8] rotate: F spec: list-del inst: bitlista name: firstN-rec-01

Additional information

Used simplifier rules: ⊦ (bits + bits0) + bits1 = bits + bits0 + bits1; Used terms: true ' + false ' + false ' + false ' + false ' + false ' + false ' + false ', false, 8