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In mathematics, a negative number is the opposite (mathematics) of a positive real number. [1] Equivalently, a negative number is a real number that is less than zero. Negative numbers are often used to represent the magnitude of a loss or deficiency. A debt that is owed may be thought of as a negative asset.
In science, an inverse-square law is any scientific law stating that the observed "intensity" of a specified physical quantity is inversely proportional to the square of the distance from the source of that physical quantity. The fundamental cause for this can be understood as geometric dilution corresponding to point-source radiation into ...
An integer is positive if it is greater than zero, and negative if it is less than zero. Zero is defined as neither negative nor positive. Zero is defined as neither negative nor positive. The ordering of integers is compatible with the algebraic operations in the following way:
Youden's J statistic is = + = + with the two right-hand quantities being sensitivity and specificity.Thus the expanded formula is: = + + + The index was suggested by W. J. Youden in 1950 [1] as a way of summarising the performance of a diagnostic test; however, the formula was earlier published in Science by C. S. Pierce in 1884. [2]
To be sure, $1 million may not be enough if you intend to spend lavishly. However, some retirees may be able to get by on $30,000 in income, in which case you may not need $1 million in order to ...
In the limit when tends to zero, the probability density () eventually tends to zero at any , but grows without limit if =, while its integral remains equal to 1. Therefore, the normal distribution cannot be defined as an ordinary function when σ 2 = 0 {\textstyle \sigma ^{2}=0} .
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A bijection with the sums to n is to replace 1 with 0 and 2 with 11. The number of binary strings of length n without an even number of consecutive 0 s or 1 s is 2F n. For example, out of the 16 binary strings of length 4, there are 2F 4 = 6 without an even number of consecutive 0 s or 1 s—they are 0001, 0111, 0101, 1000, 1010, 1110. There is ...