Question: Can someone explain this Given - --71 - -A Proof ( 1 ) -. - 7 A - - 1 ( 2] - A -

Can someone explain this

Given - --71 - -A Proof ( 1 ) -. - 7 A - - 1 ( 2] - A - - A - ( ; by Q f using double negation law ) ( 3 ) -7 ( . A ) V 7 A - ( ": by ( 2) 8 wing conditional disjun - ctions ( 4 ) R V - A - ( ' ; by 3) 8 using double neyation law) . (5 ) I - (' : by (4) and PV-P = T) mine . definition of "v') Given -7 7 9 - > 7A is true

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