Abstract
This paper has two parts. The first part (sections 1 to 5) is historical, presenting a brief history of the concept of necessity from the time of antiquity to the present. It is shown that the conceptions of necessity in antiquity had four main sources: matter-necessity, form-necessity, efficiencynecessity, and purpose-necessity. Special attention is accorded to the syncretistic concept of the necessity of fate, and its transformations from the beginning of antiquity to its end. Moreover, it is pointed out that already in antiquity we find the conception of proofnecessity, and the distinction between intrinsic and extrinsic necessity. At present, of the original four main sources of conceptions of necessity, three have dried up, leaving only form-necessity still active. The second part of the paper (sections 6 to 9) is dedicated to the development of a rigorous theory of form-necessity (or nomological necessity, broadly conceived), at the end of which a skeptical note is struck regarding laws of nature.