Meaning: necessarily or demonstrably true; "demonstrable truths"
incontrovertible, irrefutable, positive
Meaning: impossible to deny or disprove; "incontrovertible proof of the defendant's innocence"; "proof positive"; "an irrefutable argument"
The deserted mines of New Mexico show incontrovertible signs of having been successfully and extensively worked, at some remote period, for various kinds of metals.
"I have looked at the question in all its bearings, I have resolutely attacked it, and by incontrovertible calculations I find that a projectile endowed with an initial velocity of 12,000 yards per second, and aimed at the moon, must necessarily reach it.
Notwithstanding the incontrovertible nature of these circumstances, attempts have been made within the last thirty or forty years to prove that Prince Charles did leave a legitimate son, the child of his wife the Princess Louisa; and that two brothers, who until quite recently were residing in London under the pseudonyms of "Counts d'Albanie," were the children of this unknown royal prince, and therefore grandchildren of "Charles the Third."