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Hi Frank,

Up to how many arrows do you need?
I could add some extra symbols if that is helpful.

Of course, you may also create a macro that does what you want.
Assume that you wish to display a long double arrow with
some formula 'blah' above it.  Recall that the 'phantom' primitive
allows you to display 'blah' using an invisible color.
Then you may superpose (Format -> Special -> Superpose)
a single arrow with 'blah' above it and a second single arrow
with a phantom version of 'blah', while moving the second arrow
somewhat down (using Format -> Adjust -> Move).

Best wishes, --Joris


On Sat, Nov 02, 2019 at 11:31:12AM +0100, Frank wrote:
> Hello, all
> 
> I wonder how to input extensible double right arrows (with upper and
> lower scripts)? This is useful when I want to input a pair of maps.
> 
> I also wonder how to input three right arrows, four right arrows,
> etc. This is used to depict, say, simplicial objects.
> 
> -- 
> Best wishes!
> Yours,
>