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I was wondering if there was a symbol for "and"? For example, I want to say something like

$\therefore a = b \, \text{and} \, c = d $

Then can I replace "and" with a symbol?

Thanks!

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6  
Though your mathematical argument may be much more legible if you write "Therefore, $a=b$ and $c=d$." (Unless you specfically want to prove a statement formally expressed using first order logic - but then you'd already know the $\land$ symbol ...) –  Hagen von Eitzen Aug 17 '13 at 15:03
    
Oh I see. Thanks, I didn't know that. Is it general practice to use symbols only when you're proving something? or do you use them at convenience? –  Jeel Shah Aug 17 '13 at 15:08
2  
Just use a cost/benefit analysis. Costs: 1. People unfamiliar with this notation (like yourself a matter of minutes ago) will have to deduce (or guess) what it means. 2. \wedge takes more effort to type in LaTeX than and. Benefits: 1. Could potentially result in a better line break. 2. Looks more mathsy (useful for grant writing). Anything I've missed? –  Douglas S. Stones Aug 17 '13 at 15:21
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I agree that its better not to use too many logic symbols. Then people end up having to try and decipher all the symbols if there are too many. But sometimes they are helpful if a statement has ambiguities in interpretation (then the logic symbols will help to write exactly what you mean). –  Pratyush Sarkar Aug 17 '13 at 15:57
    
the wedge is standard and it is standard not to use brackets around the a=b \land c=d but i do prefer it with brackets so that it becomes (a = b) \land (c = d) –  Willemien Aug 17 '13 at 22:12

2 Answers 2

up vote 7 down vote accepted

"And": The logical symbol for and is given by $ \land$ (known as the "wedge" symbol). And for future reference, the logical symbol for or is given by $\lor$, sometimes called "vee".

In your case, you can express $a = b\;\; \text{and}\;\; c = d$ as: $$a = b\, \land\, c = d$$

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For formatting in latex/mathjax: $P \land Q$ is given by P \land Q or by P \wedge Q. –  amWhy Aug 17 '13 at 15:05
    
+1 How does this symbol wedge spell in speaking, Amy? Can I spell it as "$P$ and $Q$"? –  Babak S. Aug 18 '13 at 5:25
    
@amWhy: Can use another TU! +1 –  Amzoti Aug 19 '13 at 12:09
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@BabakS. Yes, it's simply read "P and Q". The name wedge is just a "name" of the symbol. –  amWhy Aug 19 '13 at 12:15

Yeah. The symbol $\land$ is the most common. You can look at all types of logic symbols here: http://en.wikipedia.org/wiki/List_of_logic_symbols

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