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F1 fanatic
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#1
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Hi, :confused:

I dont suppose anyone happens to be hot on Boolean algebra do they? I dont get the manipulations that you can perform to transfer to different types of logic gates. If anyone knows a how to do the below question or knows any good sites it would be very much appreciated. :confused: :confused:

using the notation A_ = not A:

rearrange the following expression so that it uses only NOT & NOR gates:
(a) A.B_.C_ + A_.B.C + A_.B_.C

(b) A_.B + A.B_

rearrange so that (b) contains only NOT & NAND functions.

As a hint I know that it uses De Morgan's Law and identities like X+0=0 & X.X_ = 1 but I have absolutely no idea how. Boolean algebra appears to be completely random & "illogical" to me. Thanks for any help you can provide.
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magiccarpet
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*vomits*
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Leekey
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(Original post by F1 fanatic)
A_.B + A.B_

((A+B_)_ + (A_+B)_)_ _
((A_+B+C)_ + (A+C_))_ _
(I think anyway....kinda hard to work with this kind of format)
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Hoofbeat
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Out of interest you're not an Oxford Physicist who has Electronics Labs either tomorrow (Fri) or had them today? Just we have the exact same ones to solve!
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Hoofbeat
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Ooooo just checked your profile and you are indeed a fellow Oxon. What college are you from? If you're doing Electronic Labs tomorrow then u must be either from Keble or University...or I suppose you could be a fellow Lincolnite but as there's only 4 of us I think I would know if you were! Anyways, if you are in electronics 2moz then I'm the girl from Lincoln College who works with quite a loud and very tall guy (Henry, my lab partner) and will probably be sitting next to 2 other quiet guys (the other 2 Lincolnites).
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Hoofbeat
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Further update: Ooo, just found out your from Keble! Quite a few of you frequent this board...I know rich does too. I'm afraid I'm not sure which of the Keble Physicists you are though as there seems to be so many of you!

Anyways, I'll shut up now as I should be doing these Logic circuit exercises before I go to Thirst.
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F1 fanatic
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(Original post by Hoofbeat)
Further update: Ooo, just found out your from Keble! Quite a few of you frequent this board...I know rich does too. I'm afraid I'm not sure which of the Keble Physicists you are though as there seems to be so many of you!

Anyways, I'll shut up now as I should be doing these Logic circuit exercises before I go to Thirst.
Very good deduction skills Holmes.

Indeed I am from Keble, We're the ones that always finish near the end. I'm with a Chinese guy. Well, see you tomorrow then
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Bezza
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Gah, you guys, using TSR to do your boolean algebra :rolleyes: Some of us were hardcore and had to try and work it out ourselves the night before labs

My answers (that got ticked but may not be the simplest forms!) were:

a) ((A_+B+C)_ + (A+C_))_ _

b) ((A+B_)_ + (A_+B)_)_ _

This is about the only practical this year I've actually got any enjoyment from so I'd make the most of it if I were you!!
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Leekey
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Absolute genius....posting questions to lab practicals on TSR! Don't suppose any of you are functional programming enthusiasts?!? :confused:
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-G-a-v-
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OK, after looking at this thread, Oxford Physics looks pretty scary. Was considerig it for a bit, but...argh that sorta stuff looks mean. Though that's probably because I've never done Boolean algebra in my life....
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Bezza
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(Original post by distortedgav)
OK, after looking at this thread, Oxford Physics looks pretty scary. Was considerig it for a bit, but...argh that sorta stuff looks mean. Though that's probably because I've never done Boolean algebra in my life....
lol, it's honestly not that scary. None of us had ever done Boolean algebra before and it's only needed for this 1 practical (so far!), and everything you need is in the practicals handbook. Normally for practicals you just turn up in the morning with the script and work through it - no need to do any work beforehand!
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-G-a-v-
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Hmm, guess that doesn't make it seem quite so bad then - I guess Boolean algebra just looks scary cos I've never done it.
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Bezza
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(Original post by distortedgav)
Hmm, guess that doesn't make it seem quite so bad then - I guess Boolean algebra just looks scary cos I've never done it.
Know the feeling!
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-G-a-v-
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Hmm...maybe they should put it in Further Maths A-level :p:- could be fun...
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Leekey
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(Original post by distortedgav)
Hmm...maybe they should put it in Further Maths A-level :p:- could be fun...
It's in the AS Electronics syllabus! If you would like some practise...AQA publish papers I think!
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-G-a-v-
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AS Electronics...ewww...I generally avoided that as far as possible when choosing my AS's, Electricity/Electronics is easily my least favourite area of Physics, though Boolean algebra looks ... interesting, so might find out a bit about it...
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Syncman
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boolean algebra = karno mapping?
btw i know karno is spelt wrong
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Leekey
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(Original post by Syncman)
boolean algebra = karno mapping?
btw i know karno is spelt wrong
They can both be used for simplifying boolean expressions but boolean algebra is generally better because it can be used for larger expressions. For example you would not really want to draw a Karnaugh map for something consisting of 5 or 6 variables. This is the reason why boolean algebra is the technique that is prefered in most cases.
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not1
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#19
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(Original post by distortedgav)
OK, after looking at this thread, Oxford Physics looks pretty scary.
Meh, Imperial physics beats Oxford hands down. :p:
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