\mathbb - LaTeX blackboard bold command

\mathbb x

Renderer support

Package	MathJax	KaTeX	XeTeX
`base`	MathJax: Full	KaTeX: Full	XeTeX: None
`bboldx`	MathJax: Full	KaTeX: Full	XeTeX: Full

Syntax#

\mathbbm{a}math content

Argspec m — one mandatory argument. Same argspec in base and bboldx. Reading argspecs

\mathbb{R}

\mathbb{Z}\subset\mathbb{Q}\subset\mathbb{R}\subset\mathbb{C}

Standard blackboard bold is for uppercase letters.

\mathbb{R}^n

bboldx

\mathbb{R}

Package	Signature	Allowed mode	Notes
`base`	`m`	math	Used for double-struck symbols such as standard number sets like ℝ, ℤ, or ℚ.
`bboldx`	`m`	math	Used for blackboard-bold symbols such as standard number sets or other distinguished mathematical alphabets, with the bboldx package selecting among its available blackboard-bold font variants.

TeXForm parses this entry as prefix syntax; the package determines its argument specification.

`base`
Input	Case	MathJax	KaTeX	XeTeX
`\mathbb{a}`	Positive · baseline	Pass	Pass	Fail
`\mathbb a`	Positive · bare[0]	Pass	Pass	Fail

`bboldx`
Input	Case	MathJax	KaTeX	XeTeX
`\mathbb{a}`	Positive · baseline	Pass	Pass	Pass
`\mathbb a`	Positive · bare[0]	Pass	Pass	Pass