# What is the truth table and propositional logic formula for AND NOT gate?

Thread Starter

#### terabaaphoonmein

Joined Jul 19, 2020
111
I thought this is NAND but no. Here is what its bipolar truth table looks like(I am not 100% sure so I am asking).

-1,-1=>-1
-1,1=>-1
1,-1=>1
1,1=>1
I forgot about kmap so I don't know how to convert this to truth value and I am not 100% sure about this as well. So plese help me guys.

#### djsfantasi

Joined Apr 11, 2010
9,079
I thought this is NAND but no. Here is what its bipolar truth table looks like(I am not 100% sure so I am asking).

-1,-1=>-1
-1,1=>-1
1,-1=>1
1,1=>1
I forgot about kmap so I don't know how to convert this to truth value and I am not 100% sure about this as well. So plese help me guys.
Ummmm, what do -1 and 1 represent in that truth table? I have yet to see a bipolar truth table (googling

#### Ian0

Joined Aug 7, 2020
8,387
Your output is exactly the same as the first input!
You have a piece of wire.

Thread Starter

#### terabaaphoonmein

Joined Jul 19, 2020
111
Ummmm, what do -1 and 1 represent in that truth table? I have yet to see a bipolar truth table (googling
1=1,-1=0

#### Ian0

Joined Aug 7, 2020
8,387
Yes - take a 4000 series CMOS gate and connect it to +5V and -5V instead of +5V and 0.

#### MrAl

Joined Jun 17, 2014
10,599
I thought this is NAND but no. Here is what its bipolar truth table looks like(I am not 100% sure so I am asking).

-1,-1=>-1
-1,1=>-1
1,-1=>1
1,1=>1
I forgot about kmap so I don't know how to convert this to truth value and I am not 100% sure about this as well. So plese help me guys.
You should be using 1 and 0 not 1 and minus 1.
Then you can check using multiplication.
That will show one of your entries is incorrect. In fact, several may be incorrect.

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