Why was this Epsilon rendered this way?

Question

I'm using Freeplane to create a mind map. I've been using TeX to organize definitions etc. I typed in the following code:
$ sigma(k): k in mathbb{N} $

and was returned with this:

Jairo A. del Rio · Accepted Answer

Use k instead of k:
$ sigma(k): k in mathbb{N} $

Remarks

You don't need to escape letters from the Latin/English alphabet in math mode. So, for a k in math mode, just write $k$ or similar (what you did in sigma(k), without a backlash).
k is an ogonek, the hook you're seeing under in. Here's a list with other shortcuts in LaTeX.

Why was this Epsilon rendered this way?

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