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