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In some books, they use a special 'i' for denoting imbedding of one Sobolev space into a another.

This 'i' is not quite like \imath.
It's like a calligraphic 'i'.

I try to find it with detexify, but it doesn't come out.
It looks like this
imbedding i

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1  
do you have an image anywhere? –  David Carlisle Oct 20 '13 at 13:42
    
@DavidCarlisle Unfortunately no. –  Nicolas Essis-Breton Oct 20 '13 at 13:57
2  
draw it on paper and upload a pic, you need to give some hint, just saying it doesn't look like \imath leaves the question a bit open;-) –  David Carlisle Oct 20 '13 at 14:03
2  
Try \i, which removes the dot above a regular i. –  Werner Oct 20 '13 at 14:42
1  
It may be helpful to take a picture of the physical symbol you need; as it stands from the picture, \imath really does seem like what you want. –  Sean Allred Oct 20 '13 at 15:15

2 Answers 2

up vote 5 down vote accepted

I'd have thought iota as Michael just said, but your drawing looks more like imath to me

enter image description here

\documentclass{article}

\begin{document}

$\textit{\i}\imath\iota$

\end{document}
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A common notation for imbeddings is the greek \iota as in $\iota$. Does it match the symbol you are looking for?

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Yes, it's \iota. Thanks. –  Nicolas Essis-Breton Oct 20 '13 at 15:21

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