> I want to know from the Postgis community/developers if there is an extra
> material that tells me the theoretical/algebraic background of this function
> and if that can be shared. 

The only thing we have are specification notes available at:

http://trac.osgeo.org/postgis/wiki/WKTRaster/SpecificationWorking02

and 

http://trac.osgeo.org/postgis/wiki/WKTRaster/SpecificationWorking03

> Does this function is based on the concept of T-norms 
> (http://en.wikipedia.org/wiki/T-norm) when using different extent
> types, i.e., INTERSECTION, UNION, FIRST, SECOND.

Maybe! You tell me!

Pierre
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