The word corollary comes from the Latin corollarĭum, from the mathematical point of view it means a truth originated as a result of a theorem. It is a proposition that does not need to be verified, since it is very easily deduced from what is demonstrated. Most of the time, the corollary immediately follows a theorem.
An example of a corollary in the field of mathematics can be the following: Taking into account the theorem "In all triangles, the internal angles are equal to 180º". Corollary A emerges; 90º is the sum of its acute angles. Corollary B; In a triangle there cannot be more than one right angle or more than one obtuse.
From the everyday point of view, it is something deductive or logical, taking into account a series of previous facts. An example of this is, "apes have less hair than a human." Therefore this theorem is followed by the corollary; gorillas do not have hair follicles on their faces.
