PATHOLOGY

Detailed explanation-1: -The Euler number is defined as number of connected regions minus number of holes, i.e. E N = C − H .

Detailed explanation-2: -Euler’s Number ‘e’ is a numerical constant used in mathematical calculations. The value of e is 2.718281828459045…so on. Just like pi(), e is also an irrational number.

Detailed explanation-3: -The exponential constant is an important mathematical constant and is given the symbol e. Its value is approximately 2.718. It has been found that this value occurs so frequently when mathematics is used to model physical and economic phenomena that it is convenient to write simply e.

Detailed explanation-4: -Euler characteristic, in mathematics, a number, C, that is a topological characteristic of various classes of geometric figures based only on a relationship between the numbers of vertices (V), edges (E), and faces (F) of a geometric figure.