Question: A problem, say P2, can be proved undecidable if we can show a reduction of an already known undecidable problem, say P1, to P2. Why

A problem, say P2, can be proved undecidable if we can show a reduction of an already known undecidable problem, say P1, to P2. Why does changing the direction of the reduction, that is showing a reduction from P2 to P1 DOES NOT prove the undecidability of P2?

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