It’s amazing how few people know the geometric definition of a parabola (the locus of points equidistant from a line and a point off the line) which makes this instantly clear
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Coordinate geometry is great, but people have lost touch with the coordinate-free reality behind it all
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of course
@DmitryBaranovsk follows@fermatslibrary too!Thanks. Twitter will use this to make your timeline better. UndoUndo
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Coolest gif ever
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Indeed, the main idea of using a dish is rejecting off-axis rays (plane waves)
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what are you tryna show me
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