Demonstration by Reducing to Absurd

The article presents the reduction ad absurdum method of demonstration followed by some representative examples. Reduction ad absurdum method is based on the logic principle of third persons (one of two contradictory sentences is true the other false, and the third possibility doesn’t exist) and it consists of the following reasoning: it is assumed that what you have to show is not true (to deny the conclusion) and by logical deductions we arrive at a contradiction with the assumption or a fact expressed and that is already accepted. In other words, we take as a starting point, in the demonstration, the sentence that is obtained by denying the conclusion and by using true sentences, we make a series of correct syllogisms, after which we arrive at a false sentence (falsity is undeniable). Then, we reason as follows: if the sentence obtained through denial of the conclusion was true, then following the correct logical reasoning we could only reach a true conclusion. A false conclusion by correct judgments was reached because the sentence obtained by denying the conclusion is false. Having the conclusion of the theorem stated that the chain receives a direction from the hypothesis to conclusion eliminating the significances. The utility of the article is by the great member of adequate examples from the method of teaching Maths problems and the teaching practice examples which offer the undergraduates-a helping hand in their formation.