Sadegh-zadeh [23] has proposed a theory of the relativity of medical diagnosis in terms of the time at which a diagnosis is accepted, the patient to whom the diagnosis applies, the physician who renders the diagnosis, the medical knowledge used, the diagnostic method applied, and the set of patient observations. Use of classical formal logic as the diagnostic method may result in three paradoxes: the paradoxes of consistency, completeness, and justifiable ignorance. These paradoxes may be resolved by the addition of (...) two non-classical operators, the certainty and effort operators, akin to the non-classical operators of modal logic. (shrink)

Medical decisions, including diagnosis, prognosis, and disease classification, must often be made on the basis of incomplete or unsatisfactory information. Data which are essential to the care of one patient may be unobtainable for technical or ethical reasons in another patient. For this reason the principles of controlled experimentation may be impossible to satisfy in human studies. In this paper, some formal aspects of medical decision making are discussed. Special operators for the intuitive concepts of certainty, demand, and effort, akin (...) to the operators of modal logic, are used to accommodate the technical and ethical limitations on human studies. Theorems are stated and proved which show how this system handles incomplete information. The embryogenesis of the human heart is presented as a sample problem in classification. (shrink)

El ensayo que presento intenta establecer la unidad conceptual entre las llamadas normas regulatorias y las normas de competencia. Para ello se hace una construcción conceptual de la norma jurídica y del orden jurídico, cuando existe una pluralidad de normas. Con base en ello se ofrece un esquema del orden jurídico que comprende tanto a las normas regulatorias como a las de competencia, estableciendo la unidad entre ambas clases de normas, considerando que las normas regulatorias son una parte de las (...) normas de competencia, en tanto determinan el contenido de las normas inferiores creadas en el ejercicio de facultades jurídicas. The essay here presented tries to establish the conceptual unity between regulatory and empowerment norms. To that effect the path taken must be to carry out a conceptual construction of the legal norm and the legal order, when there exists a plurality of norms. Thereafter, one offers an outline of the legal order that encloses both regulatory and empowerment norms, thus establishing the unity between the latter two. Furthermore, one considers that regulatory norms are a subset of empowerment norms, so far as they determine the content of inferior norms created in the exercise of legal faculties. (shrink)