User blog comment:P進大好きbot/Kyodaisuutan System/@comment-35870936-20181003040133/@comment-30754445-20181003205153

Because it's one-liner.

The challenge was to create an omega-level function with a single equation.

I still think it's over-complicated, though. Here is how I suggest we do it:

(\f(a,b,c)={a^b} \cdot \left({{3-2c} \over |4c-6|}+{{1} \over {2}} \right)+a\cdot \left({{2c-3} \over |4c-6|}+{{1} \over {2}} \right)\cdot \left({{3-2b} \over |4b-6|}+{{1} \over {2}} \right)+f(a,f(a,b-1,c),c-1)\cdot \left({{2b-3} \over |4b-6|}+{{1} \over {2}} \right)\)

This is basically a one-line definition of knuth-arrows (or 3-entry BEAF).

(and I believe this can be simplified even further by rearranging the terms)