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I have a doubt here, does the left of <-> lead to 4 paths? Could you please verify this?

in # Study-Organisation (Master) by (2.7k points)

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The rules used in the table are

  • a<->b := a&b | !a&!b (for the left)
  • a<->b := (a->b) &| (b->a) (for the right)
  • Each one of these rules branches into two subgoals, why do you think that there are four? 

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I understood that..I thought a, b|- {} is, path a and path b|-{}.
Thanks for the clarification

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