[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 4 from proof intshiftrsign32 (previous step)

# int2bits(i) ≤ 32 ⊦ bits2int(sublist(0, # int2bits(i), mklist(¬ 0 ≤ i, i→n(band(j, 31))) + int2bits(i))) = bits2int(sublist(0, 32, mklist(¬ 0 ≤ i, i→n(band(j, 31))) + fillsgn(32, int2bits(i))))

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: list-del inst: bitlista name: sublist-append-02 seq: ⊦ # bits ≤ m → sublist(0, m, bits + bits0) = bits + sublist(0, m - # bits, bits0) subst: [bits0, bits, m] → [fillsgn(32, int2bits(i)), mklist(¬ 0 ≤ i, i→n(band(j, 31))), 32] flags: rewrite

Additional information

Used simplifier rules: band-commutativity: ⊦ band(i, j) = band(j, i);%band-associativity: ⊦ band(i, band(i0, j)) = band(band(i, i0), j);%band-ls-zero-01: ⊦ ¬ band(j, 31) < 0;%band-max-02: ⊦ 0 ≤ i ∧ i ≤ i0 → ¬ i0 < band(i, j);%mk-len: ⊦ # mklist(boolvar, n) = n; from specification list-last[bitlista]%lels-01: ⊦ ¬ i ≤ j ↔ j < i; from specification int-abs%num-i2n-le: 0 ≤ i ⊦ i→n(i) ≤ (* m) ↔ i ≤ n→i(m); from specification intnat Used terms: fillsgn(32, int2bits(i)), mklist(¬ 0 ≤ i, i→n(band(j, 31))), 32