S: (v) prove, demonstrate, establish, show, shew (establish the validity of something, as by an example, explanation or experiment) "The experiment demonstrated the instability of the compound"; "The mathematician showed the validity of the conjecture"
S: (v) back, back up (establish as valid or genuine) "Can you back up your claims?"
S: (v) vouch (give supporting evidence) "He vouched his words by his deeds"
S: (v) verify (confirm the truth of) "Please verify that the doors are closed"; "verify a claim"
S: (v) prove, demonstrate, establish, show, shew (establish the validity of something, as by an example, explanation or experiment) "The experiment demonstrated the instability of the compound"; "The mathematician showed the validity of the conjecture"
S: (v) document (support or supply with references) "Can you document your claims?"
S: (v) validate (prove valid; show or confirm the validity of something)