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Proof step 43 from proof copy-stream-append (previous step)

# buf1 = n2 + n1 + m, n1 + m ≤ # buf1, n0 + m ≤ # buf0 ⊦ ⌜# buf1⌝ = ⌜n1⌝ + #((⌜buf0⌝ from n0) to m) + #(⌜buf1⌝ from n1 + m)

User applied rule insert equation

And obtained the following new goals

Proof step 44:
# buf1 = n2 + n1 + m, n0 + m ≤ # buf0, n1 + m ≤ n2 + n1 + m ⊦ ⌜n2 + n1 + m⌝ = ⌜n1⌝ + #((⌜buf0⌝ from n0) to m) + #(⌜buf1⌝ from n1 + m)

Rule argument

pos: left 1 flags:

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