[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 21 from proof bits2int-nls (previous step)

# bits < # bitsinvert(bits) +1, 2 ^ n→i(# bits) < bits2uint(bitsinvert(bits) +1), 0 < bits2uint(bitsinvert(bits) +1), bits.first, bitsinvert(bits) +1.first, 0 ≤ bits2uint(bitsinvert(bits) +1) ⊦ bitsinvert(bits) +1 = [], bits = []

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 22:
⊦ false ∈ bits → # bits +1 = # bits

Rule argument

seq: ⊦ false ∈ bits → # bits +1 = # bits subst: [bits] → [bitsinvert(bits)] rotate: F spec: bitopsaux inst: name: succ-len

Additional information

Used simplifier rules: bits2uint-2pot: ⊦ ¬ true ∈ bits → bits2uint(true ' + bits) = 2 ^ n→i(# bits);% ⊦ ¬ n < n;% ⊦ # bitsinvert(bits) = # bits;% ⊦ ¬ false ∈ bits → bits +1 = true + bitsinvert(bits);% ⊦ bitsinvert(bitsinvert(bits)) = bits;% ⊦ boolvar + bits = boolvar ' + bits;% ⊦ boolvar ' + bits ≠ [];% ⊦ (bits + bits0) + bits1 = bits + bits0 + bits1;% ⊦ #(bits + bits0) = # bits + # bits0;% ⊦ # boolvar ' = 0 +1;% ⊦ m < n + 1 ↔ ¬ n < m;% ⊦ ¬ m < n ↔ n ≤ m;% ⊦ m ≤ m;% ⊦ (m + n0) + n1 = m + n0 + n1;% ⊦ m + n = n + m;% ⊦ (boolvar ' + bits).first ↔ boolvar;% ⊦ false ∈ bitsinvert(bits) ↔ true ∈ bits;% ⊦ ¬ i < i; Used terms: bitsinvert(bits)