Attractive designs, like the austerity of the logo, the simple colors. Could you try this with an italicized font? And/or slightly increase the size of the first letters of the three words (N, E, O), to emphasize that there are 3 words.
Yours is the most "mathematical" design, which is attractive. I wonder what n=1 would look like in brackets, (n=1)? can you try some very basic math textbook-like designs?