SOLUTION: Fill in the truth table for ~p V q p | q | ~ p | ~ p V q _|__ |____ |_________

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Question 1152672: Fill in the truth table for ~p V q
p | q | ~ p | ~ p V q
_|__ |____ |_________

Found 2 solutions by Edwin McCravy, jim_thompson5910:
Answer by Edwin McCravy(20062)   (Show Source): You can put this solution on YOUR website!
| p | q | ~ p | ~ p V q |
-------------------------
|   |   |     |         |
|   |   |     |         |
|   |   |     |         |
|   |   |     |         |

Under all the letters p put TTFF

| p | q | ~ p | ~ p V q |
-------------------------
| T |   |   T |   T     |
| T |   |   T |   T     |
| F |   |   F |   F     |
| F |   |   F |   F     |

Under all the letters q put TFTF

| p | q | ~ p | ~ p V q |
-------------------------
| T | T |   T |   T   T |
| T | F |   T |   T   F |
| F | T |   F |   F   T |
| F | F |   F |   F   F |

Under all the negation symbols ~ put the opposite of what follows it:

| p | q | ~ p | ~ p V q |
-------------------------
| T | T | F T | F T   T |
| T | F | F T | F T   F |
| F | T | T F | T F   T |
| F | F | T F | T F   F |

Erase what was under the letter that followed the ~
(You don't have to erase it, but it keeps you from
getting mixed up, because you don't use it again.
You can also just mark through them:

| p | q | ~ p | ~ p V q |
-------------------------
| T | T | F   | F     T |
| T | F | F   | F     F |
| F | T | T   | T     T |
| F | F | T   | T     F |

Under the V put F only between TWO F's, otherwise put T

| p | q | ~ p | ~ p V q |
-------------------------
| T | T | F   | F   T T |
| T | F | F   | F   F F |
| F | T | T   | T   T T |
| F | F | T   | T   T F |

Then erase the ones on each side of the  last column you filled in:

| p | q | ~ p | ~ p V q |
-------------------------
| T | T | F   |     T   |
| T | F | F   |     F   |
| F | T | T   |     T   |
| F | F | T   |     T   |

You teacher might want you to leave all those columns and not erase them.
But if so, I would line through them lightly.

The final answer is TFTT.

Edwin

Answer by jim_thompson5910(35256)   (Show Source): You can put this solution on YOUR website!

p is some logical statement which is either true (T) or false (F)
q is a similar story.

Here are all the ways to have two combos of either T or F
TT
TF
FT
FF
Note how the first column has TT then FF
The second column alternates TFTF

So this is how we form the columns for p and q
pq ~p~p V q
TT  
TF  
FT  
FF  


Then we negate the first column of values. This means we flip from T to F and vice versa. This gets us the column of ~p truth values.
pq ~p~p V q
TTF 
TFF 
FTT 
FFF 


Then we apply the disjunction operation to the columns of ~p and q
The result of a disjunction is false only when both ~p and q are false; otherwise, the result is true

This is the fully filled out truth table
pq ~p~p V q
TTFT
TFFF
FTTT
FFFT


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