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I think they mean the case where a and b are variables for which you don't know the values.
by rustybolt 3y ago
I think they mean the case where a and b are variables for which you don't know the values.
- didntcheck 3y agoYeah, that's how I understood it. E.g one might write (a+b)^2 != a^2 + b^2 To mean that in general the equality doesn't hold. Despite exceptions like a=b=0 Strictly you should write something like ¬[∀ a,b (a+b)^2 != a^2 + b^2] But shorthand and abuse of notation are hardly rare
- didntcheck 3y agoNoticed a copy and paste error too late - the != in the second expression should of course be =
- coldtea 3y agoNo, that can be the case also for mathematical entities for which you can know the values, not just for "unknown variables".