What is the "+/" operator?

"Igor Khavkine" <[email protected]>
Newsgroups gmane.comp.mathematics.axiom.general
Message-ID <[email protected]> 
Can someone explain this syntax? Looking at the Axiom .spad files, I
see that it has general usage +/[...some list construction...]. But,
AFAIK, it is not documented anywhere. Is it available only in .spad
files or also at the interpreter level?

Thanks.

Igor
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