# Logic Gates Info!! :)

Discussion in 'Homework Help' started by Jover Paul Panaguiton, Jul 11, 2016.

1. ### Jover Paul Panaguiton Thread Starter New Member

Jul 11, 2016
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0
Hi guys, this is my first time and i haven't read the rules, sorry if there is anything wrong about my post

CD and CD'

are they the same? or not?

by the way, this is the logic gate that our teacher gave to us >>
{A+[B(CD')]}+E << Thank you

2. ### AlbertHall Distinguished Member

Jun 4, 2014
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Do you understand what the apostrophe means in CD' ?

3. ### Jover Paul Panaguiton Thread Starter New Member

Jul 11, 2016
4
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Yes in our study, we use it as a symbol for the logic gate NOT or INVERTER

4. ### AlbertHall Distinguished Member

Jun 4, 2014
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So if you do truth tables for CD and for CD' you will be able to see whether they are the same or not.

5. ### dannyf Well-Known Member

Sep 13, 2015
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421
CD x CD' = C x (D x D')

And what is D x D'?

6. ### AlbertHall Distinguished Member

Jun 4, 2014
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AND function is true if. and only if, all the inputs are true.

7. ### djsfantasi AAC Fanatic!

Apr 11, 2010
3,486
1,245
I don't think the OP meant AND, but simply "and". As in compare CD and CD' or in other words compare CD to CD' and determine if they are equal.

8. ### Jover Paul Panaguiton Thread Starter New Member

Jul 11, 2016
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Thank you for all the reply's guys.. but i only need to know if there the same.. FROM YOUR OPINIONS!! .. i dont need to do truth table.. i just want to know if they are the same

9. ### WBahn Moderator

Mar 31, 2012
20,075
5,666
Ah, I see. You don't want to understand whether or not they are the same or to make any attempt to figure out whether they are the same, you just want to take an opinion poll of what other people think and that's all the more effort you feel you need to put in.

But, I guess that is quite consistent with not feeling any need to read the rules you agreed to when you joined.

10. ### shteii01 AAC Fanatic!

Feb 19, 2010
3,922
601
CD
00
01
10
11 True

CD'
00
01
10 True
11

Are the above tables identical?

11. ### Papabravo Expert

Feb 24, 2006
11,083
2,159
Opinions are like elbows -- everybody has one. If our opinion was that you should fall down and cripple yourself -- would you?

Last edited: Jul 11, 2016
12. ### jpanhalt AAC Fanatic!

Jan 18, 2008
5,699
912
Are you aware of the ability to express your question as a poll? That way, I could submit your question to Watter's World and give you the definitive polled result. I think the definitive answer would be huh? (option #3)

John

13. ### dannyf Well-Known Member

Sep 13, 2015
2,196
421
CD xor CD' = C x (D xor D')

And by definition, D xor D' = ?

Done.

14. ### Papabravo Expert

Feb 24, 2006
11,083
2,159
General rule of thumb in symbolic logic. If two things are not syntactically the same, they cannot be semantically the same.

15. ### AlbertHall Distinguished Member

Jun 4, 2014
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929
Opinions are like elbows - most people have more than one.

Papabravo likes this.
16. ### Jover Paul Panaguiton Thread Starter New Member

Jul 11, 2016
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oh my god, I'm sorry guys but there has been a Type ERROR!!..

i mean CD' and (CD)'

Aw... This is what I mean... tsk not this one > CD and CD' < SORRY GUYS!! there is some mistake, and I just make you guys a little bit confused sorry .. thank you anyways

17. ### WBahn Moderator

Mar 31, 2012
20,075
5,666
Is there ANY chance that you're now willing to actually make some effort to try to answer your own question by doing a truth table for both of those and comparing them?

18. ### hobbyist Distinguished Member

Aug 10, 2008
789
73
I think where your getting confused is that you see both CD together in both propositions, however use algebraic rules for parenthesis, that should help.