Thanks for adding this!
Some boring editorial comments:
Instiki has the property that any consecutive letters in math mode are set in math-roman. This is great for long names such as , but gets in the way with the usual habit for some common pre-fixes. In any case, to make tangent bundles etc come out typeset as expected, namely as instead of there needs to be a whitespace after the :
$T X$
Apart from fixing that, I have, as usual
added a few more hyperlinks. (Notice that we have not only fiber and bundle but even fiber bundle :-)
added more cross-links (i.e. to and from this entry to related entries, such as vector field, jet bundle, variational bicomplex)
Added page for evolutionary vector field and explained how the two different definitions are related. This follows a discussion here on this paragraph.
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