Francisco Federico Raggi Cardenas, Mexican mathematician (Ciudad de Mexico 1940 – Ciudad de Mexico 12 June 2012)
Authored 38 papers
Developed homological algebra relative to hereditary torsion theory
Developed methods for studying properties of lattice in nonhereditary torsion theories
First to study the big lattice of preradicals over a ring from the lattice theory point of view (2002) and developed methods for studying it
Defined finite length dimension
Characterized classes of very important rings such as V-rings or semisimple rings
Defined prime preradicals and prime submodules of a module
Defined the concept of a main injective module, whose fully invariant submodules are in bijective correspondence with all the left exact preradicals