The phrase "a true proof" is correct and usable in written English.
It can be used when discussing the validity or authenticity of a proof in mathematics, logic, or argumentation.
Example: "In order to validate the theorem, we need to present a true proof that adheres to all established principles."
Alternatives: "a valid proof" or "an authentic proof".
An argument that does not fail in either respect is a true proof.
A true proof of whether a hormone or drug can prevent (or fail to prevent) dementia would require that the drug be taken for considerably longer than four years for the effects to become obvious on a simple mental status test.
This obviously requires some hit background music and poor lighting to be a true "proof of concept" so enjoy the videos above and after the jump.
"This facility is a true proof of our joint efforts" said Bamyan Deputy Governor Haji Qasim.
The true proof of a screen actor's skills comes when the dialogue and the camera stop and we have to be shown what the character is thinking.
Although everyone believed it was true, proof had eluded a century of mathematicians until Dr. Appel attended a lecture in 1972 by Dr. Haken.
If there was true proof that children rule at the Hawks Cay Resort, a Florida Keys fixture for six decades, it's this: Instead of a kiddie pool, the resort has an adults-only pool.
His selection of the orifice size made that quite true (proof by selection, so to speak).
The true proof of the bubble was the arrival of all of the other joint stock companies including, famously, that one to be about a great project but no one to know what it is.
Theorem 6.2 The following formula holds true: Proof By differentiating both sides of Eq. (39) with respect to the variable t, after some elementary calculations, we get the formula asserted by Theorem 6.2.
With free markets resulting from millions of simultaneous "free trade" exchanges, the only morals involved should be those of the buyer and the seller, with the strong provision that the rights of a third party are not being trampled upon (ah, a true need for government! Proof that we limited-government types aren't a bunch of crazy anarchists!).
