Standing wave

作成者:user28626

This is a standing wave on a rope which is fixed at both ends. It is created when a wave moving to the right (blue) is reflected at the boundary, generating a reflected wave (black). The sum of these two waves is a standing wave (red).

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Use a matrix with its elements as functions
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Erdős's problem #503, n=3
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SUCCESSIONE PUNTI SU SEGMENTO
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