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I'm a math layman so please be simple and straightforward. Thanks.

Are axioms/postulates in any field always so self-evident that they don't need any proofs? I could say '1+1=2' is an axiom, am I allowed to say this, or are there some requirements for an axiom to qualify as one? Could an axiom be a nonsensical truth? I suppose it could be. It depends on who is interpreting it and level of their knowledge. There is an axiom in theory of relativity that light always travels at the same speed no matter what. Well, for me it just flies over the head because I'm dumb in these things. Could you please help me with the queries on the axioms/postulates? Thanks a lot.

PS: I'm not really sure if it's really a math related stuff, if it isn't then please move it to the appropriate section. Thanks.