[see also: drop, delete, remove, dispense with]
The conclusion does not follow if continuity is omitted from the hypotheses.
So far it seems not to be known whether the geometric condition on $X$ can be omitted.
We omit further details.
The wedge denotes that $e_i$ has been omitted.
However, if $B$ were omitted in (1), the case $n=0$ would imply $Nf=1$, an undesirable restriction.
To simplify the writing, we take $a=0$ and omit the subscripts $a$.
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