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Not who you're looking for? Others named contact: 1997 film by Robert Zemeckis · 2009 film by Bentley Dean · exchange of information between two amateur radio stations · Silver Apples album
In mathematics, two functions have a contact of order if, at a point , they have the same value and equal derivatives. This is an equivalence relation, whose equivalence classes are generally called jets. The point of osculation is also called the double cusp. Contact is a geometric notion; it can be defined algebraically as a valuation.
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