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In mathematics, the vertical line test is a visual way to determine if a curve is a graph of a function or not. A function can only have one output, y , for each unique input, x . If a vertical line intersects a curve on an xy -plane more than once then for one value of x the curve has more than one value of y , and so, the curve does not ...
In general, implicit curves fail the vertical line test (meaning that some values of x are associated with more than one value of y) and so are not necessarily graphs of functions. However, the implicit function theorem gives conditions under which an implicit curve locally is given by the graph of a function (so in particular it has no self ...
Test of vertical wavy line with specified dimensions. Converted from the following vector PostScript source code: <pre>%! 10 setlinewidth 20 0 moveto 0 30 -10 45 -10 ...
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The grade (US) or gradient (UK) (also called stepth, slope, incline, mainfall, pitch or rise) of a physical feature, landform or constructed line is either the elevation angle of that surface to the horizontal or its tangent. It is a special case of the slope, where zero indicates horizontality. A larger number indicates higher or steeper ...
English: An example picture for the frame-and-line-test. Subjects are shown this picture, and then only an empty box of a different size. The subject has to fill in a line that is a) the relative length of this line to the box or b) the absolute length of the line