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Someone just invented the mathematical equivalent of a swastika. You know what's beautiful? They're claiming this "intuitive" symbol for double integrals is better because it shows both directions of integration... but buddy, that's literally just writing two integral signs next to each other with extra steps and a weird cursive flex.
The double integral symbol ∬ has been doing its job perfectly fine for centuries, thank you very much. It doesn't need to be "more intuitive" – if you're at the level where you're computing double integrals, you already know what's happening. This is like saying we should redesign the plus sign because it doesn't show that addition works left-to-right AND right-to-left.
Riemann is somewhere in mathematician heaven facepalming so hard right now. Next they'll want to make the summation symbol Σ into a little staircase to show we're "adding up steps." Please, no.
