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Proof step 7 from proof and-com (previous step)

∀ bits1, bits. # bits1 < # bits0 → true → bits = [] ∨ bits1 = [] ∨ bitsand(bits, bits1) = bitsand(bits1, bits) ⊦ bitsand(bits, bits0) = bitsand(bits0, bits), bits0 = [], bits = [], bits ≠ bits.first ' ∧ bits0 ≠ bits0.first '

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 8:
⊦ bits ≠ [] ∧ bits0 = true ' → bitsand(bits, bits0) = bits
Proof step 9:
¬(bits ≠ [] ∧ bits0 = true '), ∀ bits1, bits. # bits1 < # bits0 → true → bits = [] ∨ bits1 = [] ∨ bitsand(bits, bits1) = bitsand(bits1, bits) ⊦ bitsand(bits, bits0) = bitsand(bits0, bits), bits0 = [], bits = [], bits ≠ bits.first ' ∧ bits0 ≠ bits0.first '

Rule argument

name: and-rec-01 rotate: F subst: [bits0, bits] → [bits0, bits]

Additional information

Used simplifier rules: and-onel-01: ⊦ bits ≠ [] → bitsand(true ', bits) = bits;% ⊦ boolvar ' ≠ []; Used terms: bits0, bits