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Proof step 121 from proof bitsor-bi-sgn (previous step)

bits2int(bitsor(sgn(boolvar1 ' + bits0), bits3)) = bits2uint(bits2), bitsor(boolvar1 ' + bits0, bits3) = false ' + bits2, (¬ boolvar1) ∈ bits0, boolvar ∨ boolvar0, ∀ bits, bits1. # bits1 < #(bits3 + boolvar0 ') → true → bits ≠ [] ∧ bits1 ≠ [] → bits2int(bitsor(sgn(bits), bits1)) = bits2int(bitsor(bits, bits1)) ⊦ bits2int(bitsor(sgn(boolvar1 ' + bits0), bits3) + true ') = 1 + 2 * bits2uint(bits2), bits3 = [], ¬ boolvar ∧ ¬ boolvar0, ¬ bitsor(sgn(boolvar1 ' + bits0), bits3).first ∧ bitsor(sgn(boolvar1 ' + bits0), bits3) ≠ []

User applied rule case distinction

And obtained the following new goals

Rule argument

pos: right 4

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