Number sets such as natural numbers () or complex numbers () are not provided by default by Latex. It doesn’t mean that Latex doesn’t know those sets, or more importantly their symbols…

There are two packages which provide the same set of symbols. You can choose either of them:

`\usepackage{amsfonts}`

or

`\usepackage{amssymb}.`

Now, you have access to all the different sets through the command:

`\mathbb{set}`

Examples:

for prime numbers using `\mathbb{P}`

,

for natural numbers using `\mathbb{N}`

,

for integers using `\mathbb{Z}`

,

for irrational numbers using `\mathbb{I}`

,

for rational numbers using `\mathbb{Q}`

,

for real numbers using `\mathbb{R}`

and

for complex numbers using `\mathbb{C}`

.

Positive and non-negative real numbers, and , can now be easily typeset:

\mathbb{R}_{>0} \mathbb{R}_{\leq 0}

Lasaro

In the last line, where “\leq0″ should be replaced by “\geq 0″

Cesar

Thanks guy! That’s really help

the mad hatter

Yep, this helped me ! Thanks!

mathguy

Shouldn’t the integers be Z not I?

tom

You were right, thanks for the comment. I changed it.

Cheers,

Tom

Sean

Wow, awesome! Exactly what I needed: thanks!

Mr. Pi

This will really be helpful in writing my algebra and geometry blog, thanks.

Regards,

Mr. Pi

Enrique Argones Rúa

Why don’t you choose the more traditional notation \mathds{R}, \mathds{N}, etc.?

For using this you would have to include the package dsfont.

Cheers,

Enrique

Joe

THANK YOU! I’ve been digging around for an hour now looking for that. I can be picky about my fonts.

Joe

..I should have been more specific: thanks Enrique! The mathbb font is pretty well known, but the font for the more traditional number systems is hard to find.

kichabhai

What about binary numbers?

tom

Hi,

Not sure if a number set symbol is commonly used for binary numbers. But try the following with any letter:

Best, Tom.

one

Nice, thank you

Chewett

Thanks, very useful

Senthil

Thanks. Really its help to me.

Heni

Hi,how R^n write in Latex? THANK YOU ^^

tom

Hey Heni,

Thanks for your question. Is this what you were looking for?

Courtney

Hi! In the last line, the set of positive reals should be strictly R_>0, not R_≥0, which represents the nonnegative reals. The difference is subtle, but important

tom

Fixed! Thanks very much Courtney! Best, Tom.

m

Thanks! I found this very useful

tom

Great, glad to hear.