[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 ei 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.