Fonts & Character Sets ⇒ Blackboard greek (\nabla)

[Lumy]

Hello,

"\bbalpha" it works, but "\bbnabla" don't works. Can you help me? How can I write blackboard "nabla"?

Thank you very much.

[kaiserkarl13]

Neither of those commands is standard in LaTeX. I'm assuming you're using the mathbbol package, which defines \bbalpha and the like but not \bbnabla.

According to Scott Pakin's Comprehensive LaTeX Symbol List, the mbboard package should do what you want. I can't vouch for it, as I've never used it.