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math is literally the only subject that has rules set in stone
go past past high school and this isn’t remotely true
there are areas of study where 1+1=1
go past past high school and this isn’t remotely true
But this is a high school Maths question, so “past high school” isn’t relevant here.
In modular arithmetic you can make 1+1=0 but I’m struggling to think of a situation where 1+1=1 without redefining the + and = functions.
Not saying you’re wrong, but do you have an example? I’d be interested to see
…given specific axioms. No rules are being broken.
but which axioms you decide are in use is an arbitrary choice