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Intern  Joined: 23 Aug 2008
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Writing Mathematical Formulas in the GMAT Club Forums This  [#permalink]

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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
Attachments 2013-11-21_1309.png [ 50.59 KiB | Viewed 4913 times ]

Originally posted by prince13 on 05 Nov 2008, 08:33.
Last edited by bb on 21 Nov 2013, 14:11, edited 28 times in total.
Senior Manager  Joined: 01 Aug 2008
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Re: Writing mathematical symbols in posts  [#permalink]

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awesome find ... +1 from me as well.
Current Student Joined: 03 Aug 2006
Posts: 80
Re: Writing mathematical symbols in posts  [#permalink]

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+1 from me.
I am so addicted..and it makes things much clearer. Thank you.
Founder  V
Joined: 04 Dec 2002
Posts: 18516
Location: United States (WA)
GMAT 1: 750 Q49 V42 GPA: 3.5
Re: Writing mathematical symbols in posts  [#permalink]

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Original post updated with additional expressions.
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Manager  Joined: 08 Feb 2009
Posts: 118
Schools: Anderson
Re: Writing mathematical symbols in posts  [#permalink]

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Thanks for this post.
Current Student Joined: 03 Aug 2006
Posts: 80
Re: Writing mathematical symbols in posts  [#permalink]

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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!
Founder  V
Joined: 04 Dec 2002
Posts: 18516
Location: United States (WA)
GMAT 1: 750 Q49 V42 GPA: 3.5
Re: Writing mathematical symbols in posts  [#permalink]

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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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CIO  Joined: 02 Oct 2007
Posts: 1188
Re: Writing mathematical symbols in posts  [#permalink]

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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!
Current Student Joined: 03 Aug 2006
Posts: 80
Re: Writing mathematical symbols in posts  [#permalink]

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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 17418 times ]

Thanks again,

Nookway
Senior Manager  Joined: 25 Oct 2008
Posts: 444
Location: Kolkata,India
Re: Writing mathematical symbols in posts  [#permalink]

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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
Founder  V
Joined: 04 Dec 2002
Posts: 18516
Location: United States (WA)
GMAT 1: 750 Q49 V42 GPA: 3.5
Re: Writing mathematical symbols in posts  [#permalink]

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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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Intern  Joined: 31 Oct 2009
Posts: 23
Re: Writing mathematical symbols in posts  [#permalink]

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Now next is being able to draw figures...maybe venn diagrams could be done simply?
Manager  Joined: 06 Feb 2010
Posts: 138
Schools: University of Dhaka - Class of 2010
GPA: 3.63
Re: Writing mathematical symbols in posts  [#permalink]

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Nice...
Attachments

File comment: If u like it pls give me a Kudos..thank u great math formula.doc [21.5 KiB]

Founder  V
Joined: 04 Dec 2002
Posts: 18516
Location: United States (WA)
GMAT 1: 750 Q49 V42 GPA: 3.5
Re: Writing mathematical symbols in posts  [#permalink]

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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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Manager  Joined: 16 Jul 2009
Posts: 173
Re: Writing mathematical symbols in posts  [#permalink]

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Can someone suggest how to use the modulus operator?
CIO  Joined: 02 Oct 2007
Posts: 1188
Re: Writing mathematical symbols in posts  [#permalink]

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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?
Manager  Joined: 19 Nov 2009
Posts: 187
Re: Writing mathematical symbols in posts  [#permalink]

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Thanks for the post !
Manager  Joined: 16 Feb 2010
Posts: 109
Re: Writing mathematical symbols in posts  [#permalink]

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great, you have made the job easy.
Manager  Joined: 24 Mar 2010
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Intern  Joined: 06 Apr 2010
Posts: 49
Re: Writing mathematical symbols in posts  [#permalink]

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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. Re: Writing mathematical symbols in posts   [#permalink] 05 Aug 2010, 17:56

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