# Equal+in+number

101

**Natural number**— Natural numbers can be used for counting (one apple, two apples, three apples, ...) from top to bottom. In mathematics, the natural numbers are the ordinary whole numbers used for counting ( there are 6 coins on the table ) and ordering ( this is …102

**Partition (number theory)**— Young diagrams associated to the partitions of the positive integers 1 through 8. They are so arranged that images under the reflection about the main diagonal of the square are conjugate partitions. In number theory and combinatorics, a… …103

**42 (number)**— ← 41 43 → 42 ← 40 41 42 43 44 45 46 …104

**17 (number)**— ← 16 18 → 17 ← 10 11 12 13 14 15 16 …105

**Square number**— In mathematics, a square number, sometimes also called a perfect square, is an integer that can be written as the square of some other integer; in other words, it is the product of some integer with itself. So, for example, 9 is a square number,… …106

**24 (number)**— For other uses, see 24 (disambiguation). ← 23 25 → 24 ← 20 21 22 23 …107

**Crossing number (graph theory)**— A drawing of the Heawood graph with three crossings. This is the minimum number of crossings among all drawings of this graph, so the graph has crossing number cr(G) = 3. In graph theory, the crossing number cr(G) of a graph G is the… …108

**Avogadro's number**— , Avogadro constant (NA) a unit of relative quantity equal to the number of atoms or molecules per mole of a substance. The currently accepted value is 6.022 141 79 x 1023 per mole with an uncertainty of 0.000 000 47 x 1023 per mole (about… …109

**Computable number**— In mathematics, particularly theoretical computer science and mathematical logic, the computable numbers, also known as the recursive numbers or the computable reals, are the real numbers that can be computed to within any desired precision by a… …110

**8 (number)**— Evolution of the glyphIn the beginning, various groups in India wrote eight more or less in one stroke as a curve that looks like an uppercase H with the bottom half of the left line and the upper half of the right line removed. At one point this …