Quadratic functions in two variables
Two examples of quadratic functions are , with values
The function
is a form, since it has no linear or constant terms in it.
Level sets and graph of the quadratic function . The epigraph is anything that extends above the graph in the axis direction. This function is ‘‘bowl-shaped’’, or convex. |
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Level sets and graph of the quadratic function . This quadratic function is not convex. |
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