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Proof step 26 from proof shiftright-rec-pos (previous step)

mklist(false, i→n(i0)) + false ' ≠ [], 0 ≤ i0 ⊦ bits2int(firstn(2, mklist(false, i→n(i0)) + false ' + false ' + true ')) = bits2int((mklist(false, i→n(i0)) + false ').first ')

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 27:
0 ≤ i0 ⊦ bits2int(firstn(2, mklist(false, i→n(i0)) + false ' + false ' + true ')) = bits2int((mklist(false, i→n(i0)) + false ').first ')

Rule argument

Additional information

Used simplifier rules: ⊦ (bits + bits0) + bits1 = bits + bits0 + bits1;% ⊦ bits + boolvar ' ≠ [];