(∃X)(∃y)(Axy • X=y) ⊃ (∃X)Axx

question 144

Multiple Choice

(∃x) (∃y) (Axy • x=y) ⊃ (∃x) Axx
-Consider assuming '(∃x) (∃y) (Axy • x=y) ' for a conditional proof of the above logical truth. Which of the
Following propositions is a legitimate second step in that proof?

• A) (∃y)(Aby • y=y)
• B) Assume '(∃x)Axx' for a nested indirect proof.
• C) Aaa
• D) Aby • b=y
• E) (∃y)(Any • n=y)

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