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UnkleRhaukus
Group Title
\[\begin{array}{ccccc}\phi & \neg \phi & \psi & \phi \Rightarrow \psi & \neg \phi \vee \psi \\ \hline \\T&F&T &T&?\\T&F&F&F&?\\F&T&T&T&?\\F&T&F&T&?\end{array}\]
 2 years ago
 2 years ago
UnkleRhaukus Group Title
\[\begin{array}{ccccc}\phi & \neg \phi & \psi & \phi \Rightarrow \psi & \neg \phi \vee \psi \\ \hline \\T&F&T &T&?\\T&F&F&F&?\\F&T&T&T&?\\F&T&F&T&?\end{array}\]
 2 years ago
 2 years ago

This Question is Closed

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.2
i think i made a mistake in the table already
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.2
sorry about that
 2 years ago

RedPrince Group TitleBest ResponseYou've already chosen the best response.0
¬ϕ∨ψ means if either ¬ϕ is true or either ψ is true or both are true then the answer is true otherwise it is false ¬ϕ is false but ψ is true so the answer is true, and so on
 2 years ago

RedPrince Group TitleBest ResponseYou've already chosen the best response.0
post your question again and right!!
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.2
\[\begin{array}{ccccc}\phi & \neg \phi & \psi & \phi \Rightarrow \psi & \neg \phi \vee \psi \\ \hline \\T&F&T &T&T\\T&F&F&F&F\\F&T&T&T&T\\F&T&F&T&T\end{array}\] is that right?
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.2
it makes sense now, your answer form before , was right for the table i posted originally
 2 years ago

RedPrince Group TitleBest ResponseYou've already chosen the best response.0
last one is wrong one of ψ and ¬ϕ is true, so how can it be true.....!!! check this! http://www.hermit.cc/teach/ho/dbms/optable.htm
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
hmmm It seems to be that you are correct Unkle
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
I cant seem to find where you went wrong. Everything seems correct
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.2
cool, what about this one \[\begin{array}{cccccc}\phi & \psi & \neg\psi & \phi \Rightarrow \psi & \phi \not\Rightarrow \psi &\psi\wedge\neg\psi\\ \hline \\T&T &F&T&\\T&F&T&F&\\F&T&F&T&\\F&F&T&T& \end{array}\]
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
The last column is obv false
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
I am not sure what that sign is of the second to last column
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.0
You were correct above, proving that the statements are logically equivalent
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.2
dw:1348840677936:dw
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.2
phi does not imply psi
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
hmmm Y have I never come across that one????? Ok Let me go get my book and see
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
Well isnt that then the same as ~(P>Q) I mean it should just be the opposite of the column before
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.2
\[\begin{array}{cccccc}\phi & \psi & \neg\psi & \phi \Rightarrow \psi & \phi \nRightarrow \psi &\phi\wedge\neg\psi\\ \hline \\T&T &F&T&\\T&F&T&F&\\F&T&F&T&\\F&F&T&T& \end{array}\]
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
waitttt we didnt finish the previous one lol
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.2
is \[\phi\nRightarrow\psi\] the same as \[\neg\phi\Rightarrow\psi\]?
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
Noooo IN brackets
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
\(\neg(\phi\Rightarrow\psi)\)
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
cuz idk I remember doing this stuff and we never came across that symbol
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.2
ok so you were right\[\phi\nRightarrow\psi\]\[\downarrow\]\[\neg(\phi\Rightarrow\psi)\]\[\downarrow\] opposite to the previous column,
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
The last column is F T F F
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.2
\[\begin{array}{cccccc}\phi & \psi & \neg\psi & \phi \Rightarrow \psi & \phi \nRightarrow \psi &\phi\wedge\neg\psi\\ \hline \\T&T &F&T&F&F\\T&F&T&F&T&T\\F&T&F&T&F&F\\F&F&T&T&F&F \end{array}\]
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
Ya that is correct
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.2
how did you get the last column ?
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
Ok well that is known as the and connective And the rule there is that a true with False=False A false with a fasle is false and a true with a true =true And it should make sense logically in your brain FALSE AND FALSE=FALSE TRUE AND FALSE cant be true it must be FALSE TRUE AND TRUE is obv TRUE
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.2
i dont think i understand the difference between ¬φ ∨ ψ these φ ∨ ¬ψ
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
Ok well firstly the connective is the or connective and its always true except when both compartments are false So TRUE OR TRUE=TRUE TRUE OR FALSE=TRUE Lets take the sentence I went to bed early or i went to bed on time Its true statement even though one half of the sentence contradicts the other FALSE OR FALSE+FALSE
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
FALSE OR FALSE=FALSE
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
The only difference is which column you will use.
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
Like one phi is negative and the other psi is negative
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
Well basically if you dont understand the difference then you are basically not following how truth tables are formed
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
ok lets make a truth table.
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
dw:1348842795418:dw
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
This drawing board was def testing my patience
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
the way i figured out the last 2 columns was look at the appropriate 2 columns and decide if it would be true or false
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
Do you follow?
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.2
YES that table makes sense now thankyou ! @swissgirl
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
lol I hope so. Its kinda hard to explain but if you start from the wayyyyyy begginning then like once you get it its simple
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.2
i guess we can conclude that \[\phi\Rightarrow\psi\qquad\leftrightarrow\qquad\neg\phi\vee\psi\] and \[\phi\nRightarrow\psi\qquad\leftrightarrow\qquad\phi\vee\neg\psi\]
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
I dont like the second part of your conclusion Are you sure that it is correct?
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.2
oh yeah i got that a wrong
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.2
\[\phi\nRightarrow\psi\qquad\leftrightarrow\qquad\phi\wedge\neg\psi\]
 2 years ago

swissgirl Group TitleBest ResponseYou've already chosen the best response.1
YAAA thats correct
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.2
thanks again,
 2 years ago
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