check for a point
any algebraic expression
This function returns true if and only if P is an equation or set of equations, each of which are of the form x=e where x is a name that is not a constant, and e is an algebraic expression that does not contain x.
The names x are intended to define the coordinate space, and the expressions e are the corresponding coordinate values.
Objects of type point differ from objects of type Point in the (now deprecated) student package in that the coordinates are defined by names rather than by position in a list.
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