This volume is a collection of my essays on philosophy of logic from a phenomenological perspective. They deal with the four kinds of logic I have been concerned with: formal logic, transcendental logic, speculative logic and hermeneutic logic. Of these, only one, the essay on Hegel, touches upon 'speculative logic', and two, those on Heidegger and Konig, are concerned with hermeneutic logic. The rest have to do with Husser! and Kant. I have not tried to show that the four logics are compatible. I believe, they are--once they are given a phenomenological underpinning. The original plan of writing an Introduction in which the issues would have to be formulated, developed and brought together, was abandoned in favor of writing an Introductory Essay on the 'origin'- in the phenomenological sense -of logic. J.N.M. Philadelphia INTRODUCTION: THE ORIGIN OF LOGIC The question of the origin of logic may pertain to historical origin (When did it all begin? Who founded the science of logic?), psychological origin (When, in the course of its mental development, does the child learn logical operations?), cultural origin (What cultural - theological, metaphysical and linguisti- conditions make such a discipline as logic possible?), or transcendental constitutive origin (What sorts of acts and/or practices make logic possible?).

called in question, then naturally no fact, science, could be presupposed. Thus Plato was set on the path to the pure idea. Not gathered from the de facto sciences but formative of pure norms, his dialectic of pure ideas-as we say, his logic or his theory of science - was called on to make genuine 1 science possible now for the first time, to guide its practice. And precisely in fulfilling this vocation the Platonic dialectic actually helped create sciences in the pregnant sense, sciences that were consciously sustained by the idea of logical science and sought to actualize it so far as possible. Such were the strict mathematics and natural science whose further developments at higher stages are our modem sciences. But the original relationship between logic and science has undergone a remarkable reversal in modem times. The sciences made themselves independent. Without being able to satisfy completely the spirit of critical self-justification, they fashioned extremely differentiated methods, whose fruitfulness, it is true, was practically certain, but whose productivity was not clarified by ultimate insight. They fashioned these methods, not indeed with the everyday man's naivete, but still with a na!ivete of a higher level, which abandoned the appeal to the pure idea, the justifying of method by pure principles, according to ultimate a priori possibilities and necessities.

Alexander Pfänder's classical phenomenological logic, a masterwork of unmatched clarity, is presented here for the first time in English. The book unfolds the general essence of logic, its object, not acts of thinking but objective "thoughts", meanings and higher unities formed by them: the nature and kinds (1) of judgments (propositions) and their truth and truth claims, (2) of concepts, and (3) of inferences; (4) the first foundational principles of logic (the principles of identity, contradiction, excluded middle, and sufficient reason) and of valid inferences, their foundation in ontological principles, as well as the valid forms of reasoning recognized in traditional logic and the reasons of their validity. Being a new phenomenological exposition of traditional logic, it reduces the symbolic language used to a minimum in order to concentrate on the logical meanings and laws themselves for which these symbols are signs.

entirety to contemporary readers." --Book Jacket.

Coinciding with the renewed interest in Husserl and the origins of phenomenology, Logical Investigations, his most famous and influential work, is presented here in paperback for the first time.

In this 2005 book, logic, mathematical knowledge and objects are explored alongside reason and intuition in the exact sciences.

The twelve original studies collected in this volume examine different aspects of Edmund Husserl's Logical Investigations. They are authored by scholars and specialists internationally recognized for their expertise in the fields of logic, phenomenology, history of philosophy and philosophy of mind. They approach Husserl's groundwork from different angles and perspectives and shed new light on a number of issues such as meaning, intentionality, ontology, logic, etc.

Martin Heidegger's 1925-26 lectures on truth and time provided much of the basis for his work, "Being and Time". This title is central to Heidegger's overall project of reinterpreting Western thought in terms of time and truth. It shows the degree to which Aristotle underlies Heidegger's hermeneutical theory of meaning.