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# Writing Mathematical Formulas in the GMAT Club Forums This

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05 Nov 2008, 07:33
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Writing Mathematical Formulas in the GMAT Club Forums

This post is just for those curious about writing neat maths formulae in forum posts... I looked it up because I was typing out questions and wanted to use symbols such as $$\leq$$ rather than writing the <= symbol (I was using quite a few of them, which was starting to look confusing)
Don't you think that $${(\sqrt{9+sqrt{80}}+\sqrt{9-\sqrt{80}})^2}$$ is much easier to understand than – (sqr root of (9 +sqr root of 80)+sqr root of (9 - sqr root 80))^2?

The simple instructions:
(1) write formula as usual, e.g. x^2 + (x+3)^2 > 1
(2) highlight the text that is a formula, and then click the "m" button at the top of the edit box. This will enclose it with little "m" boxes (similar to adding color to a part of text), and tells the forum to display your text as a formula: $$x^2 + (x+3)^2 > 1$$
(3) that's it, simple. Most formula will display automatically. Fractions, roots and other exceptions are below.

Common symbols that can be used within your formula (selected with GMAT in mind):

Fractions:
$$\frac{a+b}{c}$$ --- \frac{a+b}{c} - note that numerator and denominator have to be enclosed in {} and you have to write out \frac to tell the system that it is a fraction.

Powers and roots
$$x^2$$ --- x^2
$$x^{12}$$ --- x^{12} - note that multi-digit powers require {}

$$\sqrt{x}$$ --- \sqrt{x} - note the {} and \sqrt to identify the square root
$$\sqrt[n]{x}$$ --- \sqrt[n]{x}

Inequalities
$$\approx$$ --- \approx
$$\leq$$ --- \leq
$$\geq$$ --- \geq
$$\neq$$ --- \neq

Subscript
$$x_1, x_2$$ --- x_1, x_2

Geometrical
$$\pi$$ --- \pi
$$90^{\circ}$$ --- 90^{\circ}
$$\alpha$$ --- \alpha
$$\angle$$ --- \angle
$$\triangle$$ --- \triangle

Full reference link for the extra curious:
http://en.wikibooks.org/wiki/LaTeX/Mathematics#Math_operators
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2013-11-21_1309.png [ 50.59 KiB | Viewed 2916 times ]

Last edited by bb on 21 Nov 2013, 13:11, edited 28 times in total.
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Re: Writing mathematical symbols in posts [#permalink]

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11 Mar 2009, 06:27
awesome find ... +1 from me as well.
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10 Jun 2009, 13:20
+1 from me.
I am so addicted..and it makes things much clearer. Thank you.
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13 Jun 2009, 17:50
Original post updated with additional expressions.
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14 Jun 2009, 09:25
Thanks for this post.
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16 Jun 2009, 10:28
Hello bb, I need your help. Is there a master list of all the symbols. I was trying to get the angle symbol and based on Latex website it should be \angle however this results into another type of angle symbol $$\angle$$ on Gmatclub forums. Hopefully you can point to the right source.

Thanks!
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16 Jun 2009, 11:40
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nookway wrote:
Hello bb, I need your help. Is there a master list of all the symbols. I was trying to get the angle symbol and based on Latex website it should be \angle however this results into another type of angle symbol $$\angle$$ on Gmatclub forums. Hopefully you can point to the right source.

Thanks!

Nookway - thank you for your commitment to the math symbols - your math posts rock!
Let me research with the tech experts. I believe the \angle one works with GMAT Tests - not sure why it would not work here....
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Re: Writing mathematical symbols in posts [#permalink]

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17 Jun 2009, 00:46
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Hi nookway,

I believe the symbols look different because we use slightly different software. We use the same '\angle' -> $$\angle$$ symbol in our Math Tests.

There are two other types of angle symbols, but I'm not sure they are intended for geometry:
$$\langle$$ - \langle
$$\rangle$$ - \rangle

Hope this helps

nookway wrote:
Hello bb, I need your help. Is there a master list of all the symbols. I was trying to get the angle symbol and based on Latex website it should be \angle however this results into another type of angle symbol $$\angle$$ on Gmatclub forums. Hopefully you can point to the right source.

Thanks!

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22 Jun 2009, 14:41
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Hi dzyubam,

Thanks for the clarification. It does seem there are some differences. $$\angle$$ should work for me. The symbol I was referring to can be seen in the image below.

Attachment:

angle.gif [ 1.17 KiB | Viewed 15424 times ]

Thanks again,

Nookway
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17 Jul 2009, 18:35
This will make the posts very clear.However I tried the fraction and it did'nt work.Could you tell me where I went wrong to save you the trouble in future posts?thanks!
problem-solving-question-on-ratios-79240.html#p607940
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Re: Writing mathematical symbols in posts [#permalink]

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17 Jul 2009, 19:58
tejal777 wrote:
This will make the posts very clear.However I tried the fraction and it did'nt work.Could you tell me where I went wrong to save you the trouble in future posts?thanks!
problem-solving-question-on-ratios-79240.html#p607940

Code:
You did everything right, just needed to put [m] tag in the beginning and [/m] in the end.
The M-tags (there is an "m" button) are used to identify beginning and end of the area that you want to be converted into a math symbol

I added them to your post - you can see the code if you hit EDIT
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01 Nov 2009, 19:14
Now next is being able to draw figures...maybe venn diagrams could be done simply?
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07 Mar 2010, 21:36
Nice...
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Re: Writing mathematical symbols in posts [#permalink]

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08 Mar 2010, 13:52
monirjewel wrote:
Nice...

1. Slightly wrong topic to post this.
2. The time conversion formula you suggested does not always work. For example if you have 135 minute and 200 minutes, you will get 335, add 40 and you will get 375... what do you do with that?
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16 Mar 2010, 02:40
Can someone suggest how to use the modulus operator?
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16 Mar 2010, 03:26
I'd just use the "|" signs to enclose a particular expression. See an example below.

$$\sqrt{x^2} = |x|$$

Code:
[m]\sqrt{x^2} = |x|[/m]

abhi758 wrote:
Can someone suggest how to use the modulus operator?

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20 Mar 2010, 22:44
Thanks for the post !
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17 May 2010, 06:28
great, you have made the job easy.
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31 May 2010, 22:13
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05 Aug 2010, 16:56
Thanks for putting the pics. I'm a visual guy so that really helped. I was wondering what m-tags meant. I thought they were complicated html code.
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Re: Writing mathematical symbols in posts   [#permalink] 05 Aug 2010, 16:56

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