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Proof step 1 from proof datasize-split-empty-h (conclusion)

⊦ m ≤ # buf ∧ m = # buf0 ∧ m0 ≤ # buf1 ∧ buf = buf0 + buf1 ∧ buf1 = mkempbuf(# buf1) → datasize(buf, # buf0 + m0) = datasize(buf0, # buf0)

System applied rule normalize

And obtained the following new goals

Rule argument

Additional information