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| a positive number that is equal to the sum of all positive integers that are submultiples of it, as 6, which is equal to the sum of 1, 2, and 3 |
| a series of points as in forming a curve or surface, each of which represents a value of a given function, a network of lines connecting points |
| harmonic progression | |
| —n | |
| a sequence of numbers whose reciprocals form an arithmetic progression, as 1, ½, 1⁄3, … | |
| harmonic progression
A sequence of quantities whose reciprocals form an arithmetic progression, such as 1, 1/3 , 1/5 , 1/7 , .... and so on. |