| 单词 | pi |
| 释义 | pi (Greek letter π) The ratio of the circumference of a circle to its diameter. π is a constant, equal to 3.141593 to six decimal places; π is a transcendental number whose value cannot be given precisely in any number of decimal places. Upper case ∏ is used to express the product of N numbers x1, x2, …, xN in the form Px = ∏i xi. Lower case π and upper case ∏ are also widely used in economics to stand for variables ad hoc. |
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