it can be said that the first major part of stoicism is the logic of logos theory. this principle, from which the concept of natural law is interpreted from, is the largest contribution of greek culture to the human thinking heritage. in stoicism, logos is the rational order governing the world or the structure that indicates the rational order of the world. this rational principle is described...

If A and B are a pair of invertible matrices of the same size, then the product AB is nonsingular, too, and the inverse of the product AB satisfies the reverse-order law (AB)−1 = B−1A−1. This law can be used to find the properties of (AB)−1, as well as to simplify various matrix expressions that involve the inverse of a matrix product. However, this formula cannot trivially be extended to the M...

Paris law constants are commonly obtained with a well established procedure based on standard specimens, notched and pre-cracked. Pre-cracking produces through cracks with stable shapes, nearly straight, similar during all propagation. However, in several situations specimens with corner and surface cracks are recommended. In these cases cracks having significant propagation will continuously m...