# Euler Circles !!!

Truth tables are related to Euler circles. Arguments in the form of Euler circles can be translated into statements using the basic connectives and the negation as follows:

Let p be "The object belongs to set A." Let q be "the object belongs to set B."

All A is B is equivalent to p →q.

No A is B is equivalent to p →∼q.

Some A is B is equivalent to p ∧ q.

Some A is not B is equivalent to p ∧∼q.

Determine the validity of the next arguments byusing Euler circles, then translate the statements into logical statements using the basic connectives, and using truth tables, determine the validity of the arguments. Compare your answers.

(a) No A is B. (b) All B is A.

Some C is A. All C is A.

∴ Some C is not B. ∴ All C is B.

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