The Existential Assumption & the Square of Opposition Discussion




In the classical and medieval version of the Square of Opposition, the truth of an A-proposition entails the truth of the corresponding I-proposition.  So, if “All horses are mammals” are true, then “At least one horse is a mammal” is true.  Why is this called “the existential assumption”?  And is it a good assumption to make?Up to 20 points for your comment, and 10 for your reply to someone else.

Save your time - order a paper!

Get your paper written from scratch within the tight deadline. Our service is a reliable solution to all your troubles. Place an order on any task and we will take care of it. You won’t have to worry about the quality and deadlines

Order Paper Now

Reply To:

The reason why it is called the existential assumption is because it implies that some class is not empty, which means that there is at least one member of the class. I would agree that it is a good assumption because of the fact that horses are real subjects that exist in the world and are categorized as mammals. In addition, we could swap the subject with the predicate in the I-claim and see if the meaning is preserved or not. According to the material within the Module Two, when we mean “at least one”, we could use “some'” to indicate that there could also be more than one. Based on this rule, the claim “At least a horse is a mammal” can be rewritten as “Some horses are mammals”. Next, we could swap the subject and the object and come up with a claim as “Some mammals are horses“, which seems to be valid and is also applicable to reality. Edited by An Hsuan Kung on Sep 18 at 2:51pm

Looking for a similar assignment? Our writers will offer you original work free from plagiarism. We follow the assignment instructions to the letter and always deliver on time. Be assured of a quality paper that will raise your grade. Order now and Get a 15% Discount! Use Coupon Code "Newclient"