[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 189 from proof bytes2int-int2bytes-len-eq (previous step)

127 < band(b2i(by), 255) ∧ band(b2i(by), 255) ≤ 255, bytes1 = int2bytes(bytes2int(bytes1)), 0 < band(b2i(by), 255), 127 < band(b2i(by), 255), 0 ≤ bytes2int(bytes1), 0 ≤ band(b2i(by), 255), 0 < bytes2int(bytes1) * 256 + band(b2i(by), 255), 255 < bytes2int(bytes1) * 256 + band(b2i(by), 255), band(b2i(by), 255) < 256, ∀ bytes0. # bytes0 < #(bytes1 + by ') → true → # bytes0 = # int2bytes(bytes2int(bytes0)) → bytes0 = int2bytes(bytes2int(bytes0)) ⊦ bytes1 = [], by = (i2b(0) ' + i2b(band(b2i(by), 255) - 256) ').last

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 190:
bytes1 = int2bytes(bytes2int(bytes1)), 255 < bytes2int(bytes1) * 256 + band(b2i(by), 255), 0 < bytes2int(bytes1) * 256 + band(b2i(by), 255), 0 ≤ band(b2i(by), 255), 0 ≤ bytes2int(bytes1), 127 < band(b2i(by), 255), 0 < band(b2i(by), 255), band(b2i(by), 255) ≤ 255, 0 < bytes2int(bytes1), ∀ bytes0. # bytes0 < #(bytes1 + by ') → true → # bytes0 = # int2bytes(bytes2int(bytes0)) → bytes0 = int2bytes(bytes2int(bytes0)) ⊦ by = i2b(band(b2i(by), 255) - 256), bytes1 = []

Rule argument

Additional information

Used simplifier rules: ⊦ i < j ∧ 0 ≤ i → 0 < j; (forward)% ⊦ i + j = j + i;% ⊦ i + j + i0 = (i + j) + i0;% ⊦ i * j = j * i;% ⊦ i * j * j0 = (i * j) * j0;% ⊦ 0 < i → (0 < i * j ↔ 0 < j);% ⊦ i < i + j ↔ 0 < j;% ⊦ i ≤ j ∧ j < j0 → i < j0; (forward)%j0 ≠ 0, j < j0 ⊦ i ≤ (* j) → i < (* j0);% ⊦ (bytes + bytes0) + bytes1 = bytes + bytes0 + bytes1;% ⊦ (bytes + by ').last = by;% ⊦ band(i, j) = band(j, i);