Well, math itself is abstract, so it doesn't have the burden of needing to exist in physical space. Physical, objective space can not be proven conclusively (and by definition, neither can subjective space), so we are left with "I" and all of our abstracts.
The only abstract that I know of that deals with truths is math... 1 = 1 is an abstract thought which is always true. 1 != 1 is always false... (that's "not equal" for those who aren't familiar with C style programming languages.) I can just as easily use x = x, or flat = flat, as the symbols don't matter, only the ability to compare equal values.
Of course, if I see "x = x + 1," rather than thinking that the statement is false, I'm going to think that we have an inexperienced programmer on our hands... x++ is so much easier to read, debug, type, and all sorts of things.
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