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The proof is not verifiable - it only proves the result for two specific even integers, not all even integers.

The proof is not logical - it doesn't follow that the two integers selected are even.

The proof is not logical - it doesn't follow that the expression 2(x + y) is even.

There is nothing wrong with the proof.

If P is true, and P implies Q, then Q is true.

If P and Q are true, then P implies Q.

If P implies Q, then Q is true.

If Q is true, and P implies Q, then P is true.

A previously proved theorem that can be used as part of a proof.

A logical consequence that has been derived as part of a proof.

A hypothesis which is not yet known to be true.

A fundamental property that is always taken to be true.

The proof is not sequential: some steps depend on information that comes later.

A false conclusion has been drawn.

There are no logical deductions in this proof: it is simply a set of facts or assumptions that doesn't tell us anything new.

There is nothing wrong with the proof.