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Proof step 9 from proof and-size-one-01 (previous step)

bits2 = bits3 + boolvar ', # bits2 = # bits1, ∀ bits, bits1, bits0. # bits < # bits2 → # bits = # bits1 → bits1 = [] ∨ bits0 = [] ∨ bitsand(true ' + bits, bits0 + bits1) = bits0 + bitsand(bits, bits1) ⊦ bits2 = [], bits1 = [], bits0 = [], bitsand(true ' + bits3, bits0 + bits1.butlast) + (boolvar ∧ bits1.last)' = bits0 + bitsand(bits2, bits1), # bits0 + # bits1 = 0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 10:
# bits3 + 1 = # bits1, ∀ bits, bits1, bits0. # bits < #(bits3 + boolvar ') → # bits = # bits1 → bits1 = [] ∨ bits0 = [] ∨ bitsand(true ' + bits, bits0 + bits1) = bits0 + bitsand(bits, bits1) ⊦ bits1 = [], bits0 = [], bitsand(true ' + bits3, bits0 + bits1.butlast) + (boolvar ∧ bits1.last)' = bits0 + bitsand(bits3 + boolvar ', bits1), # bits0 + # bits1 = 0

Rule argument

Additional information

Used simplifier rules: ⊦ bits + boolvar ' ≠ [];% ⊦ (bits + bits0) + bits1 = bits + bits0 + bits1;% ⊦ # boolvar ' = 0 +1;% ⊦ #(bits + bits0) = # bits + # bits0;