Consider the sentence: There is a country that borders both India and Pakistan. Which expression is correct, where Country(x) means x is a country and Border(x, y) means x and y share a border?
Pick an option to check yourself, or open the answer below.
Show answer & explanation
Correct answer: A. ∃c Country(c) ∧ Border(c, India) ∧ Border(c, Pakistan)
Explanation
An existential is paired with ∧: some c is a country and borders both. Using ⇒ under ∃ (B) is satisfied by anything that is not a country.
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