It is super difficult to think of examples that have even a whiff of universality. Even finding things that don’t interact with identity in rage-inducing ways is tricky.
These (hopefully politically inert) maths examples might help you get the idea.
1 + 1 = 2
Knowledge: Arithmetic requires this or the entire mathematical enterprise falls apart. (assuming a base greater than 2, pedant)
0.999… = 1
Belief: I can see why this is not as immediately obvious as 1 + 1 = 2, but it’s just as true.
Imaginary numbers are as arbitrary as negative numbers.
Opinion: Counting numbers work with the analogy of how many apples you have. Everything else doesn’t. I can see why imaginary numbers seem more made up: you learn them much later and the name certainly doesn’t help, but they’re not in different categories of arbitrariness.
0! = 1
Assent: I watched the video. Sure, whatever.
1 is/n’t a prime number
Apathy: 1 is an exception either way.
1+2+3… = -1/12
Dissent: I’m pretty sure this has broken a rule somewhere and done something with infinity or equals that it shouldn’t have.
Disbelief: I see mathematics and numbers as internally consistent fictions/human inventions useful for modelling the physical world. I know the majority of people disagree, but any other position seems ridiculous to me.
1 + 1 = 3
Incredulity: Arithmetic requires this to be false or the entire mathematical enterprise falls apart.