Proving of De Morgan Theorems (both) using Boolean Algebra??

is ne1 out der who can prove dt theorems??i hv one bt it bit complex..plz guyz help me out...

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for any boolEAN variable
a a'=1
a.a'=0

let p=A B
if de morgan law is true then p'=A'.B'

now if de morgan law is true the p and p' should obey the boolean laws

p p'=1
p.p'=0

substitute the value of p and prove the above using simple boolean algebra....

study

Source:SUMITA ARORA

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can we do it using Truth Tables...??? Shocked

aaaa....its easy tht way.. Wink

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@ saif
shouldn't it be
p=A+B
p'=A'.B' Question

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If u hav sumita arora buk.. then its there..!