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在數學上,沒有這個要求. 在應用科學上,當然一定有它的非常具體意義,例如電磁學中, 電荷的密度積出電荷總量,電場強度的通量也是積出電荷總量. 在應用科學中,被積函數如果沒有具體的物理意義,那就是亂彈琴!
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