The Pi symbol is giving us that shifty side-eye because it knows exactly what's happening. Mathematicians love to prove something in one direction, then casually drop "the other direction is trivial" when it's actually a nightmare of calculations they're too lazy to write out. It's the academic equivalent of saying "I could totally beat that guy in a fight" when the guy left hours ago. That smug little Pi face is every professor who's ever skipped the hard part and expected students to "fill in the details as an exercise."
The Other Direction Is Trivial

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