What is the gender of $K(\pi,n)$ in French?

Question

This is a kind of silly question, but I don't know where else to ask. Suppose I wanted to say "Ceci n'est pas une pipe" but with $K(\pi,n)$ substituted for "pipe." Would the article be "un" or "une"?

In case there are additional complications in the translation: What would be the French for "This is not a $K(\pi,n)$," where "this" refers to a picture over/under/beside the text?

Answer 1

Espace and K both take "un".$\quad$

Answer 2

You would use the same gender that the object's name has. For example, one could say:

Ceci n'est pas un $\triangle$ beside the picture of a square, but one could say

"Voici la $\mathscr{L}(cos(t))$" besides the expression of $\cos(t)'s$ Laplace transform.