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I am using svjour3 template to submit a paper. My problem is LaTeX faces these errors:

Undefined control sequence
 \mathbb{} .

Similarly

 Undefined control sequence
 \mathfrac{} .
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1 Answer

up vote 3 down vote accepted

Load the amssymb package for \mathbb and \mathfrak (sic!).

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@ lockstep perfect now the environment align gives me another trouble what should i do? –  MON Jul 14 '11 at 18:56
    
@MON: Thanks for accepting my answer, but please also upvote it (this has to be done separately from accepting it). –  lockstep Jul 14 '11 at 18:56
    
I wish I could up-vote it several times ;) –  MON Jul 14 '11 at 18:57
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@MON: For align load the amsmath package. –  lockstep Jul 14 '11 at 18:57
    
Awesome! thanks a lot. –  MON Jul 14 '11 at 19:00
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