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Restate question: What is an example of a non-function?

The equation of a circle is x2 + y2 = r2. Since a function can only be intersected once by a vertical line, the circle is not a function (almost any vertical line through the circle will cut it twice).

If you solve the equation for y, you must write: y = +/- sqrt(r2-x2), so for each value of x there are TWO values of y.

Q: What is an None example of function?

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NONE

Y = X2 Is a parabolic function.

None.

y = cuberoot(x) for real x is not a rational function.

None. The full name is the Probability Distribution Function (pdf).

Related questions

"None" can function as a pronoun indicating no amount or quantity. For example, "None of the cookies were left."

None.

A function call is where you "call" a function and execute its body. For example: void example() { } int main() { example(); // call the function "example" and execute its bodyreturn 0; }

It is a Basic Statistical Function.

(none)

None, because there is no such word!

NONE

Y = X2 Is a parabolic function.

None.

It is called callback function. For an example see the qsort function.

Yes, none of the X values repeat, therefore it is a function. X=0 is not a function though.

y = cuberoot(x) for real x is not a rational function.