Proofs Define Proofs at Dictionary able to withstand successful in not being overcome proof against temptation impenetrable, impervious, or invulnerable proof against outside temperature changes used for testing or proving serving as Proofs definition of proofs by The Free Dictionary Printing trial print, pull, slip, galley, page proof, galley proof, trial impression I m correcting the proofs of the Spanish edition right now adjective impervious , strong , tight , resistant , impenetrable , repellent The fortress was proof against attack. Proof Definition of Proof by Merriam Webster Historically, Senate rules required a filibuster proof coalition of votes in order to confirm a Supreme Court hopeful Jay Willis, GQ, Why Justice Kennedy s Retirement Is Even Worse Than You Think, June Myers husband called Fish and Game and put what remained of the family s livestock in a bear proof dumpster. Five Proofs of the Existence of God Edward Feser Edward Feser s Five Proofs of the Existence of God takes five arguments and demonstrates that they prove with certainty that God exists, assuming that the premises are true He shows that the premises are reasonable and does indeed present cogent arguments for believing that God exists. Mathematical proof While using mathematical proof to establish theorems in statistics, it is usually not a mathematical proof in that the assumptions from which probability statements are derived require empirical evidence from outside mathematics to verify. Proofs of the Pythagorean Theorem Brilliant Math Two Algebraic Proofs using Sets of Triangles The theorem can be proved algebraically using four copies of a right triangle with sides a , b, and c arranged inside a square with side c, as in the top half of the diagram.