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Proof step 4 from proof bitsand-len-true (previous step)

# bits1 < # bits ⊦ # bitsand(bits, true ' + bits1) = # bits, bits = []

User applied rule induction

And obtained the following new goals

Proof step 5:
# bits1 < # bits, ∀ bits, bits0. # bits0 < # bits1 → # bits0 < # bits → # bitsand(bits, true ' + bits0) = # bits ∨ bits = [] ⊦ # bitsand(bits, true ' + bits1) = # bits ∨ bits = []

Rule argument

indvar: # bits1 wfpred: <

Additional information

Used simplifier rules: <; (wellfounded) Used terms: # bits1