Some people are friends of every person they know. Every person knows someone (or other). Therefore, at
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Some people are friends of every person they know. Every person knows someone (or other). Therefore, at least one person is a friend of someone. (Px: x is a person; Fxy: x is a friend of y; Kxy: x knows y)
Translate the following arguments into symbolic form. Then derive the conclusion of each, using conditional proof or indirect proof when needed.
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Some people are friends of every person they know xy Px z Kxz Fxy There exists at least one person x ...View the full answer
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Related Book For 
A Concise Introduction to Logic
ISBN: 978-1305958098
13th edition
Authors: Patrick J. Hurley, Lori Watson
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