What is the gender of $K(\pi,n)$ in French?
Solution 1:
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.
Solution 2:
Espace and K both take "un".$\quad$