[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 32 from proof shiftzero-rec-neg-shorter (previous step)

i→n(j) = m0 + 1, # int2bits((i - 1) / 2) ≤ m, i < ~1, i < 0, 1 < j, 0 < j ⊦ i = ~1, j = 0, bits2uint(firstn(m, mklist(false, m0) + (mklist(true, m - # int2bits((i - 1) / 2)) + int2bits((i - 1) / 2)) + (i % 2 ≠ 0)')) = bits2int(firstn(m, mklist(false, m0) + mklist(true, m - # int2bits((i - 1) / 2)) + int2bits((i - 1) / 2)))

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 33:
⊦ n < # bits → firstn(n, bits) = firstn(n, bits.butlast)
Proof step 34:
m < #(mklist(false, m0) + (mklist(true, m - # int2bits((i - 1) / 2)) + int2bits((i - 1) / 2)) + (i % 2 ≠ 0)'), i→n(j) = m0 + 1, # int2bits((i - 1) / 2) ≤ m, i < ~1, i < 0, 1 < j, 0 < j ⊦ i = ~1, j = 0, bits2uint(firstn(m, (mklist(false, m0) + (mklist(true, m - # int2bits((i - 1) / 2)) + int2bits((i - 1) / 2)) + (i % 2 ≠ 0)').butlast)) = bits2int(firstn(m, mklist(false, m0) + mklist(true, m - # int2bits((i - 1) / 2)) + int2bits((i - 1) / 2)))

Rule argument

seq: ⊦ n < # bits → firstn(n, bits) = firstn(n, bits.butlast) subst: [bits, n] → [ mklist(false, m0) + ( mklist(true, m - # int2bits((i - 1) / 2)) + int2bits((i - 1) / 2)) + (i % 2 ≠ 0)', m] rotate: F spec: list-del inst: bitlista name: firstn-butlast-intro

Additional information

Used simplifier rules: ⊦ #(bits + bits0) = # bits + # bits0;% ⊦ # mklist(boolvar, n) = n;% ⊦ # boolvar ' = 0 +1;% ⊦ (bits + bits0) + bits1 = bits + bits0 + bits1;% ⊦ n ≤ n0 → (m + (n0 - n)) + n = m + n0;% ⊦ (m + n0) + n1 = m + n0 + n1;% ⊦ m + n = n + m;% ⊦ m < n + 1 ↔ ¬ n < m;% ⊦ ¬ m + n < m; Used terms: mklist(false, m0) + (mklist(true, m - # int2bits((i - 1) / 2)) + int2bits((i - 1) / 2)) + (i % 2 ≠ 0)', m