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Prove the logical equivalence ๏ฟข ๐‘ โ†’ ๏ฟข ๐‘ž โ‰ก ๐‘ž โ†’ ๐‘ using equivalencelaws.

Question

Prove the logical equivalence ๏ฟข ๐‘ โ†’ ๏ฟข ๐‘ž โ‰ก ๐‘ž โ†’ ๐‘ using equivalencelaws.

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Solution

Sure, here is the step-by-step proof of the logical equivalence ยฌ๐‘ โ†’ ยฌ๐‘ž โ‰ก ๐‘ž โ†’ ๐‘ using equivalence laws:

  1. Start with the left side of the equivalence: ยฌ๐‘ โ†’ ยฌ๐‘ž
  2. Apply the implication law, which states that ๐‘ โ†’ ๐‘ž is equivalent to ยฌ๐‘ โˆจ ๐‘ž. This gives us ยฌยฌ๐‘ โˆจ ยฌ๐‘ž.
  3. Apply the double negation law, which states that ยฌยฌ๐‘ is equivalent to ๐‘. This gives us ๐‘ โˆจ ยฌ๐‘ž.
  4. Apply the commutative law, which allows us to swap the order of the disjunction. This gives us ยฌ๐‘ž โˆจ ๐‘.
  5. Apply the implication law again, this time in reverse, to get ๐‘ž โ†’ ๐‘.
  6. Therefore, ยฌ๐‘ โ†’ ยฌ๐‘ž is logically equivalent to ๐‘ž โ†’ ๐‘.

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