New answers tagged logic
If you wish to convey the idea that your colleague was attempting to falsely convey the notion of truth in his argument you could say: A colleague argued speciously that writing requires big hands. I rebutted with my own evidence which exposed his artifice.
rebuttal, n rebut verb (rebuts, rebutting, rebutted) [with object] 1 Claim or prove that (evidence or an accusation) is false: he had to rebut charges of acting for the convenience of his political friends syn: refutation, denial, countering, invalidation, negation, contradiction "now that you've heard the accusations, have you a rebuttal?" ...
I think that the term you are looking for is disprove by contradiction. However, I think that Morton's counterexample is also a very good answer.
That's a counterexample. From Oxford: An example that opposes or contradicts an idea or theory. Merriam-Webster has it stronger than that: an example that refutes or disproves a proposition or theory. (I personally would have written it as counter-example, but all the dictionaries I looked at excluded the hyphen, so it looks like the ...
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