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) neutralize, neutralise, nullify, negate (make ineffective by counterbalancing the effect of) "Her optimism neutralizes his gloom"; "This action will negate the effect of my efforts"