[Imprint][Data Privacy Statement][E-Mail]

View long theorem info. View the proof. Back to main index. View the specification. View theorem base summary, View theorem base listing, the used properties by spec, the dependency list, the symbol table,

Proof step 46 from proof and-ass (previous step)

∀ bits2, bits0, bits1. # bits2 < #(bits4 + boolvar0 ') → true → bits2 = [] ∨ bits0 = [] ∨ bits1 = [] ∨ bitsand(bits2, bitsand(bits0, bits1)) = bitsand(bitsand(bits2, bits0), bits1) ⊦ bits + boolvar1 ' = (bits + boolvar1 ').first ', bits3 + boolvar ' = (bits3 + boolvar ').first ', bitsand(bits4 + boolvar0 ', bitsand(bits, bits3) + (boolvar1 ∧ boolvar)') = bitsand(bitsand(bits4, bits) + (boolvar0 ∧ boolvar1)', bits3 + boolvar '), bits4 + boolvar0 ' = (bits4 + boolvar0 ').first '

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 47:
⊦ 1 < # bits ∧ 1 < # bits0 → bitsand(bits, bits0) = bitsand(bits.butlast, bits0.butlast) + (bits.last ∧ bits0.last)
Proof step 48:
¬(1 < #(bits4 + boolvar0 ') ∧ 1 < #(bitsand(bits, bits3) + (boolvar1 ∧ boolvar)')), ∀ bits2, bits0, bits1. # bits2 < #(bits4 + boolvar0 ') → true → bits2 = [] ∨ bits0 = [] ∨ bits1 = [] ∨ bitsand(bits2, bitsand(bits0, bits1)) = bitsand(bitsand(bits2, bits0), bits1) ⊦ bits + boolvar1 ' = (bits + boolvar1 ').first ', bits3 + boolvar ' = (bits3 + boolvar ').first ', bitsand(bits4 + boolvar0 ', bitsand(bits, bits3) + (boolvar1 ∧ boolvar)') = bitsand(bitsand(bits4, bits) + (boolvar0 ∧ boolvar1)', bits3 + boolvar '), bits4 + boolvar0 ' = (bits4 + boolvar0 ').first '
Proof step 51:
1 < #(bits4 + boolvar0 ') ∧ 1 < #(bitsand(bits, bits3) + (boolvar1 ∧ boolvar)'), ∀ bits2, bits0, bits1. # bits2 < #(bits4 + boolvar0 ') → true → bits2 = [] ∨ bits0 = [] ∨ bits1 = [] ∨ bitsand(bits2, bitsand(bits0, bits1)) = bitsand(bitsand(bits2, bits0), bits1) ⊦ bits + boolvar1 ' = (bits + boolvar1 ').first ', bits3 + boolvar ' = (bits3 + boolvar ').first ', bitsand((bits4 + boolvar0 ').butlast, (bitsand(bits, bits3) + (boolvar1 ∧ boolvar)').butlast) + ((bits4 + boolvar0 ').last ∧ (bitsand(bits, bits3) + (boolvar1 ∧ boolvar)').last) = bitsand(bitsand(bits4, bits) + (boolvar0 ∧ boolvar1)', bits3 + boolvar '), bits4 + boolvar0 ' = (bits4 + boolvar0 ').first '

Rule argument

name: and-rec rotate: F subst: [bits0, bits] → [bitsand(bits, bits3) + (boolvar1 ∧ boolvar)', bits4 + boolvar0 ']

Additional information

Used terms: bitsand(bits, bits3) + (boolvar1 ∧ boolvar)', bits4 + boolvar0 '