sale is the alienation of goods with all presumptive, objective and, legal rights related to them in a way that a buyer can have the goods in absolute legal possession. any defects in seller’s ownership, such as the right of easement, usufruct or lien belong to the third party interferes with the absolute ownership of the buyer and his rights. a kind of these rights recognized and protected by ...

recently, the finished cost reduction policy-as an efficient economic policy for competitiveness of domestic products beside foreign competitors-has been paying attention by ministry of commerce of iran. at the fist look, the protection of intellectual property such as inventions increases the finished cost of products; but intellectual property protection can be effective in finished cost redu...

‎Let $D$ be an integral domain with quotient field $K$‎, ‎$E$ be a $K$-vector space‎, ‎$R = D propto E$ be the trivial extension of $D$ by $E$‎, ‎and $w$ be the so-called $w$-operation‎. ‎In this paper‎, ‎we show that‎ ‎$R$ is a $w$-FF ring if and only if $D$ is a $w$-FF domain; and‎ ‎in this case‎, ‎each $w$-flat $w$-ideal of $R$ is $w$-invertible.

In this paper we give conditions for a tuple of commutative bounded linear operators which holds in the property of the Hypercyclicity Criterion. We characterize topological transitivity and semi-hereiditarily of a dynamical system given  by an n-tuple of operators acting on a separable infinite dimensional Banach space .

Let $T$ be a bounded linear operator on a Hilbert space $mathscr{H}$. We say that $T$ has the hyponormal property if there exists a function $f$, continuous on an appropriate set so that $f(|T|)geq f(|T^ast|)$. We investigate the properties of such operators considering certain classes of functions on which our definition is constructed. For such a function $f$ we introduce the $f$-Aluthge tran...

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