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Musik, Instrument, Mandola, Holzstich, 19. Jahrhundert, Musikinstrument, Musikinstrumente, Streichinstrument, Streichinstrument, Streichinstrumente, Streichinstrumente, Zupfinstrument, Zupfinstrumente, Chordophon, Quinterna, Chiterna, Instrument ...
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Fermat's Library on Twitter: "The nabla symbol, commonly used in math to represent the gradient of a function ∇f, is so-called because it looks like a harp and the Greek word for
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