after forty years, the act of motor vehicle compulsory insurance was amended in 1387(2008).the act has changed some areas and protected third parties rather than former act. some protections are: increasing third parties, development of sphere of insurance and acceptance of an insurance policy as a mortgage in courts. however we see some ambiguities in the late act. the article analyses changes...

In this paper $S$ is a monoid with a left zero and $A_S$ (or $A$) is a unitary right $S$-act. It is shown that a monoid $S$ is right perfect (semiperfect) if and only if every (finitely generated) strongly flat right $S$-act is quasi-projective. Also it is shown that if every right $S$-act has a unique zero element, then the existence of a quasi-projective cover for each right act implies that ...