The test of value existence

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A test of value existence is a value allowing to know if a value (calculus, measure or function) previously created exists or not.

The value returned is 1 if the associated value exists and 0 otherwise.

For example, let's suppose you have created a figure with a unity length have created a point M intersection of circle de center O with a line.

For some positions of the line, M may not exist. If you want to know if point M exists, , measure first length OM, then create a test of value existence of this  length via menu Calculus - New real calculus - Test of value existence.