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Proof step 1 from proof datasize-subarray0 (conclusion)

m ≤ # buf ⊦ datasize(subarray(buf, 0, m)) = datasize(buf, m)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ datasize(buf) = datasize(buf, # buf)
Proof step 3:
m ≤ # buf ⊦ datasize(subarray(buf, 0, m), m) = datasize(buf, m)

Rule argument

Additional information

Used simplifier rules: datasize: ⊦ datasize(buf) = datasize(buf, # buf);% ⊦ # subarray(buf, m, n) = n; (s)