direction ratios
where either the + sign or the − sign is taken throughout. So any triple of numbers, not all zero, determine two possible sets of direction cosines, corresponding to opposite directions. The triple l, m, n are said to be direction ratios of a straight line when they are direction ratios of either direction of the line.
- Whitehead, Alfred North
- Whitney embedding theorem
- whole angle
- whole number
- Wiener, Norbert
- Wilcoxon paired sample test
- Wilcoxon rank-sum test
- Wilcoxon signed rank test
- Wiles, Andrew John
- Wilson's theorem
- winding number
- within-subjects design
- Witten, Edward
- Wolf Prize
- word
- word problem
- work
- work–energy principle
- wrt
- X
- x-axis
- xor
- y
- Y
- Yates' correction