after 22 chapters so far and the MC having published several research papers at a prestiguous Mage Journal (hand waving time skip with that), the author has yet to clearly layout where and how calculations are even used in spell casting. What are the input variables for the spells? I'm assuming they're different for each spell or spell type. What's changing such that a spell NEEDS to be recalculated every time it is cast?

There was only a brief sentence mentioning "coordinates" being inputted. It can't just be coordinates, right? Even for coordinates, coordinates of what and how are these coordinates determined to begin with?

That said, what information are these calculations even supposed result in? Is it just a single calculation for a spell or multiple? How does the result fit in the spell casting? Nothing is explained.

In the story, the MC just shouts the spell name to cast his spells (the amazingly fast spell casting as perceived by others). Presumably, he's doing the calculations in his head. Yet, take space magic as an example. Shouldn't the calculations for space magic be difficult? Yet, when he uses space magic offensively in a life or death battle, all he seemingly does is shout the spell's name to invoke it. Where is the math?

For more complicated spell forumlas, when he's not fighting for his life, he's got his Casio calculator with it's built in scientific functions. The treatment of his calculator in the story is odd too. I would have assumed he would treat his calculator as super secret, but he has no problems with whipping it out amongst casual friends. Friends who conveniently ignore it right after their initial "wow! That's cool" reaction. In addition, there's no thought about preserving the easily lose-able calculator. If it was me, one of the first things I'd do is to make hard copies of all of the calculator's saved formulas and programs.

You could just replace the "math" for this story's gimmick with anything else and there wouldn't be much to adjust in this story.

There's a couple more minor peeves, but I'll leave this rant as-is for now.