[amavect]

Some other definition fun: Should we define 0 both positive and negative, or neither positive and negative? Does monotonically increasing mean x<y -> f(y)<f(x) or x≤y -> f(x)≤f(y)? Should we deny the law of excluded middle and use constructive math? Does infinity exist? If infinity exists, is it actual (as an object) or potential (as a function)? Is the axiom of choice true? Or, is the axiom of determinacy true?

Should we use a space-time manifold, or separate space and time dimensions? Do future objects exist, and do past objects exist? Do statements about the future have a definite truth value? Does Searle's Chinese Room think? Which Ship of Theseus is the original: the slowly replaced ship, or the ship rebuilt from the original parts?

I find that so many philosophy debates actually argue over definitions rather than practical matters, because definitions do matter. Well, add your own fun definition questions!

[LegionMammal978]

What's worse, French typically uses positif to mean "greater than or equal to 0", so some people will act confused if you use English 'positive' instead of 'strictly positive' to mean "greater than 0".