# Adding mathbb letters to org-entities

To make it so that, i.e., \vdots is displayed as ⁞ one can:

(add-to-list 'org-entities-user
'("vdots" "\\vdots{}" t "&x2999" "..." "..." "⁞")
)


However, I get "invalid function" errors when I try to get i.e. \mathbb{R} to display as ℝ:

(add-to-list 'org-entities-user
'("vdots" "\\vdots{}" t "&x2999" "..." "..." "⁞")
("mathcal{R}" "\\mathcal{R}" t "&x211D" "R" "R" "R")
)


Question: Is there a way to add the mathbb alphabet to org-entities-user?

The problem seems to be with the braces in the name attribute of the org entity:

(setq org-entities-user
'(("vdots" "\\vdots{}" t "&x2999" "..." "..." "⁞")
("mathcalR" "\\mathcal{R}" t "&x211B" "R" "R" "ℛ")
("mathbbR" "\\mathbb{R}" t "&x211D" "R" "R" "ℝ")))

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• Welcome. Does this also work for the OP's mathcal? – Andrew Swann May 16 at 11:46
• Yes, I wrote the examples with mathbb to be consistent with the desired symbol ℝ. I have edited the answer to illustrate the use with both symbols \mathbb{R} ℝ and \mathcal{R} ℛ. – JacintoCC May 17 at 10:01
• This gets rid of the "invalid function" errors but still doesn't display properly: imgur.com/a/ELrKJuA Is this the same on your machine? – George 2 days ago
• The org entity is mathcalR, so you must write \mathbbR in org-mode, which is exported in latex as \mathbb{R} and displayed as ℝ. – JacintoCC 3 hours ago