July 23rd, 2015, 10:03 AM  #1 
Senior Member Joined: Dec 2012 From: Hong Kong Posts: 853 Thanks: 311 Math Focus: Stochastic processes, statistical inference, data mining, computational linguistics  How do you write the real number symbol?
I'm genuinely curious about this. How does one write the symbol denoting the set of real numbers on paper? Does one need to write two overlapping Rs? Thanks.

July 23rd, 2015, 10:06 AM  #2 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms 
Generally I write a normal capital R with an extra stroke to the left of the stem.

July 23rd, 2015, 05:15 PM  #3 
Global Moderator Joined: May 2007 Posts: 6,680 Thanks: 658 
There are no had and fast rules. Use whatever symbol you want, but make sure you define it first.

July 23rd, 2015, 05:47 PM  #4 
Math Team Joined: Jul 2011 From: Texas Posts: 2,815 Thanks: 1458 
$\displaystyle \mathbb{R}$

July 24th, 2015, 10:04 AM  #5 
Senior Member Joined: Dec 2012 From: Hong Kong Posts: 853 Thanks: 311 Math Focus: Stochastic processes, statistical inference, data mining, computational linguistics 
Thanks guys. I'll go by CRGreathouse's method since it's easy to write that.

July 24th, 2015, 03:38 PM  #6 
Senior Member Joined: Jan 2014 From: The backwoods of Northern Ontario Posts: 390 Thanks: 70 
It's even simpler to use a bolded R for the set of real numbers... just as a bolded Q is used for the set of rational numbers.

July 24th, 2015, 04:43 PM  #7 
Senior Member Joined: Nov 2010 From: Indonesia Posts: 2,001 Thanks: 132 Math Focus: Trigonometry  
July 27th, 2015, 06:47 PM  #8 
Newbie Joined: Jul 2015 From: greece Posts: 2 Thanks: 0  
July 27th, 2015, 08:21 PM  #9 
Senior Member Joined: Nov 2010 From: Indonesia Posts: 2,001 Thanks: 132 Math Focus: Trigonometry  
July 27th, 2015, 10:01 PM  #10 
Math Team Joined: Nov 2014 From: Australia Posts: 689 Thanks: 244 
Real numbers is $\mathbb{R}$. Rational numbers is $\mathbb{Q}$. 

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