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In mathematics, what do symbols that look like "ru" and "U" mean respectively? What do "ru" and "u" mean in mathematics?
1, the mathematical meaning is; The eleventh Greek letter is also a symbol of logical operation. Eigenvalues in linear algebra. Other meaning: the physical symbol of wavelength. Radiological decay constant.

2, u Mathematical meaning: arithmetic average. One millionth of Micro is used for micron again. Other meaning: The magnetic permeability of electricity. Particle physics, the symbol of hermit. Friction coefficient. м in Cyrillic letters and m in Latin letters.

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