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Exact Sequences - functions on longright arrows

Peter

Well-known member
MHB Site Helper
Jun 22, 2012
2,918
In exact sequences, a convenient notation is to have a function symbol like
on a longrightarrow.

I have given an example of this in the attachment so it is clear what notation I am requesting help with - see attachment "Exact Sequences - Latex Question"

I have also provided an attachment showing the start of Section 10.5 (Exact Sequences) of Dummit and Foote where there are a number of examples of the terminology I am hoping to use in Latex encoded postings.

If someone can help me with this problem I would be most grateful

Peter

[This has also been posted on MHF]
 

Opalg

MHB Oldtimer
Staff member
Feb 7, 2012
2,703
\stackrel{\psi}{\longrightarrow}: $\stackrel{\psi}{\longrightarrow}$
 

Peter

Well-known member
MHB Site Helper
Jun 22, 2012
2,918

Evgeny.Makarov

Well-known member
MHB Math Scholar
Jan 30, 2012
2,492
Also, \xrightarrow[\text{below arrow}]{\text{above arrow}} gives $\xrightarrow[\text{below arrow}]{\text{above arrow}}$, and \overset{\psi}{\longrightarrow} gives $\overset{\psi}{\longrightarrow}$. The latter command is provided by the amsmath package, and, unlike \stackrel, can be used on ordinary symbols and binary operators and not only relations. See also this thread.