They'll obey you to the point of worshipping you, your cat army will be infuriated with any human that insults you to the point of hating all of humanity except you,rampaging across the world killing and destroying humanity .This may be a good thing however you will be hated by your own kind...
I'm sure it's this one.
Sore wa Totsuzen, Unmei no Aite ga : https://mangadex.org/title/1906/sore-wa-totsuzen-unmei-no-aite-ga
It matches your description very well.
You mean pure math right? What about physics .Since your superpower can solve complicated questions it doesn't mean the power will avoid your brain from bursting if you use it at your full capacity resulting in you falling asleep in an eternal slumber..... In other words die,hence your power is...
@kuma It's probably from the LN volume 2 ( I don't know which chapter because it's not being translated.)
However,the web novel is being translated and this part happens in Arc 2 chapter 3.
Hope I answered your question!