LEASE of PREMISES is a contract have a lot of application in society.in accordance with existance of some practical results on division between translative and promissory theory of the LEASE: such as possibility of possession of interests to others by LEASE holder analysis of the translative theory-that is an accepted theory by famous Islamic jurisprudents and civil law- is nessacery.

Background and Aim: In present era, one of the new and important issues in the field of medical issues is the treatment of infertility in couples and having baby by artificial fertilization methods. One of the new methods in this field is surrogacy, so that the applicant rents another woman's uterus to spend the period of carrying her fetus so that the fetus is born from her. Materials and Methods: This descriptive-analytical study seeks a well-reasoned juridical answer for the validity of surrogacy contracts. So by using the library resources, it examines the subject of research in jurisprudential books and also adaptes the conditions for surrogacy validity such as determining the benefit of the LEASEd action, the existence of the intended benefit and the permission to receive the rent and … with surrogacy and finaly its selected defining and declaratory law is expressed. Conclusion: This article examines the argumentative and jurisprudential issues related to this issue and jurists’ views and it concludes that there is a connection between reproduction and marital relationship in Islam. Therefore, it is not possible to using uterus of another woman to have children, and renting a uterus for this purpose will be void. The surrogacy contracts and receiving wage will be valid and permissible only in the cases of artificial fertilization permission, such as the use of the uterus of a second spouse or temporary spouse.

The rent for ownership agreement is an agreement, which its virtue, the object of transaction is rented provided that the ownership of the object of transation to be trasferred to tenant in case that all conditioins of agreement and installments of the rent paid by tenant. This agreement is among the legal instituions that although has no jurisprudence background and is not mentioned in eivil law, but is accepted in all of our legal sestem. The reason may be that despite of similiarities and differences with similar legal instituions, it has some advantages toward them, e.g the legla indentity of thes agreement is rent and it is differen with sale on installments, optional sale and suspended immediately after the agreement but in the rent for ownership will not be obtained for buyer before obtaining suspender and having and holding the object of sale is not legal, but in the rent for ownership toward the interest of premise and is correct. So we conclude that the condition of ownership in the rent for ownership is a resull condition. General speaking, the agreement of the rent for owership wich is a necessary, changeable and ownership agreement an can be on house,land or and other goods in various sectors like agriculture and servicess and the general principles on the parties of agreement is depending on the LEASE agreement.

The two parts of a LEASE contract cannot always assign the period of LEASE. Sometimes it isn't mentioned any period in contract but they assert the smallest unit of time for assignment of the rental. Therefore the civil low makes reputable the LEASE contracts that the period of rent is left unsaid in them for the same smallest unit of time. In spite of that the legal spirit of this agreement isn't so distinct to accredit the contracts lacking of period.In this paper it has been tried to study such contracts and at same times the legal spirit of these agreement has been investigated.

The doctrine that the content of the conclusion of a deductively valid argument is included in the content of its PREMISES, taken jointly, is a familiar one. It has important consequences for the question of what value valid arguments possess, since it indicates the poverty of three traditional answers: that arguments may and should be used as instruments of persuasion, that they may and should be used as instruments of justification; and that they may and should be used to advance knowledge. The truth is, however, that in each of these cases the argument has only a managerial role and, if there is any work done, it is the PREMISES that do it. It will be maintained that this point has little force against the critical rationalist answer, which I shall defend, that the principal purpose of deductive reasoning from an assemblage of PREMISES is the exploration of their content, facilitating their criticism and rejection. That said, the main aim of the present paper is not to promote critical rationalism but to consider some published objections to the doctrine that a statement asserts every statement that is validly deducible from it. The alleged counterexamples to be considered fall roughly into two groups: statements that emerge with time from a rich mathematical or empirical theory, but were originally unformulated and are deducible from the theory only in a non-trivial way (Frederick 2011, 2014; Williamson 2012); and statements, notably disjunctions, that are easily formulated and are deducible from a theory in a trivial way (Schurz & Weingartner 1987; Mura 1990, 2008; Gemes 1994; Yablo 2014). Each of these counterexamples will be evaluated and dismissed.

This paper focuses on a comparison between LEASE and purchase while analyzing the effective features in making a decision on and selecting each. To do this, elements like cash outlay, the risk of absolescene, the abolition of LEASE and the possibility of cash allocation for profitable uses are dealt with. Besides, to present a concise comparison, different alternatives of purchase such as financing through borrowing and financing by means of installment sale are explained and exemplified by conditional sales and chattel mortgage, respectively. Cash circulation, tax factor, the omission of operations expenses, scrap and present values, as well as relevant problems in LEASE and purchase are also discussed.

Background: logic considered as a tool in the form of rules and principles with the aim of preventing thought from deviations. Basically, value and credit of thought (scientific) activities can be determined by the logic principles. Medical ethics as a blend of experimental and humanistic knowledge needs logic for presenting proper, concrete and rational definitions and reasoning and Conclusively, for being safe from unwanted and ignorant made mistakes which may bear irreparable complications.In this paper have been tried within a brief introduction to logic rules and principles some related medical ethics referents been shown and overall the interrelationship of the two being scrutinized. Method: In this conforming study have been attempted within a cursory review of the logic content, some medical ethics related instances communicating to each logical parts being introduced. Findings: logic trace can be found in the most of medical ethics discussions. The most basic purpose of this paper, has been introducing the applicability and the stand of logic in medical ethics. In this way, It can be claimed utilizing and observing logic would result in a rational, assuring and free from incorrect base in medical ethics. Meanwhile, the logic "five crafts" (Sanaate Khams) might help the one to insert logic in his taking, writing and behavior; moreover, could reinforce the person’s ability to recognize rights from wrongs.Conclusion: logic could be considered as a common language in medical ethics between different societies with various viewpoints and attitudes. The logic language is the language of thought and reason and because of its potentiality in providing scientific negotiating environments between different ideas might be considered as a beneficial and effective tool in designing international practical guidelines in the field of medical ethics.So it would be important that the interrelation of logic and medical ethics and the need to apply logic in the scientific literature of global bioethics being seen seriously.