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#1 2011-07-07 06:21:31
- dangermulan1988
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question about how to determine Tautologies, Contradictions & Continge
please delete
Last edited by iwan_ccie (2011-07-11 23:38:34)
#2 2011-07-07 07:49:12
- anonimnystefy
- Real Member
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Re: question about how to determine Tautologies, Contradictions & Continge
hi iwan_ccie
first one is a contradiction
second one is a contradiction
third one is a tautology
fourth one is contingent
and the fifth one is also contingent.
The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“A secret's worth depends on the people from whom it must be kept.” ― Carlos Ruiz Zafón
#3 2011-07-07 07:57:16
- anonimnystefy
- Real Member
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Re: question about how to determine Tautologies, Contradictions & Continge
hi iwan_ccie
there are several ways to determine if a proposition is a tautology or a contradiction.
the easiest one is to make a table,make columns for all the boolean variables and then plug them into the equation and if the equation is always true then it is a tautology,and if it is always incorrect than it is a contradiction.
the other one works only when you have to prove that it is a tautology.it is called reductio ad absurdum.
The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“A secret's worth depends on the people from whom it must be kept.” ― Carlos Ruiz Zafón
#4 2011-07-07 08:07:06
- dangermulan1988
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Re: question about how to determine Tautologies, Contradictions & Continge
Thanks for your answer!
So you created truth tables?
Can you show me how you did this? And how you determined the answers?