Schreger lines are the unique identifiers of what valuable substance whose usage has led to the dwindling numbers of something large?
Schreger line Schreger line Schreger lines are visual artifacts that are evident in the cross-sections of ivory. They are commonly referred to as cross-hatchings, engine turnings, or stacked chevrons. Schreger lines can be divided into two categories. The easily seen lines which are closest to the cementum are the "outer Schreger lines". The faintly discernible lines found around the tusk nerve or pulp cavities are the "inner Schreger lines". The intersections of Schreger lines form angles, which appear in two forms: concave angles and convex angles. Concave angles have slightly concave sides and open to the medial (inner) area of the tusk.
History of large numbers along with negative numbers and zero, were quite advanced in this aspect. By the 7th century, Indian mathematicians were familiar enough with the notion of infinity as to define it as the quantity whose denominator is zero. Far larger finite numbers than any of these occur in modern mathematics. For instance, Graham's number is too large to express using exponentiation or even tetration. For more about modern usage for large numbers, see Large numbers. To handle these numbers, new notations are created and used. The ultimate in large numbers was, until recently, the concept of infinity, a number defined by