Cusp (singularity)
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In mathematics, a cusp, sometimes called spinode in old texts, is a point on a curve where a moving point must reverse direction. A typical example is given in the figure. A cusp is thus a type of sin
An ordinary cusp occurring as the caustic of light rays in the bottom of a teacup.
René Thom
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René Frédéric Thom was a French mathematician, who received the Fields Medal in 1958.
Thom in 1970
