10 1 c 6. A mathematical sentence can also use symbols or words like equals greater than or less than. Some examples of existential statements are - There exists a natural number n such that n x n 36 There exists an integer z such that z 2 25 There is at least one number n belonging to a set.
The moon is made of cheese.
6y - 50 100. The proof begins with the given information and follows with a sequence of statements leading to the conclusion. A single letter shall be used to denote a statement. An open sentence in math means that it uses variables meaning that it is not known whether or not the.