Definition that contains real number
- imaginary (mathematics) a number of the form a+bi where a and b are real numbers and i is the square root of -1
- irrational a real number that cannot be expressed as a rational number
- interval a set containing all points (or all real numbers) between two given endpoints
- real matrix a matrix whose elements are all real numbers
- numerical value a real number regardless of its sign
- complex quantity (mathematics) a number of the form a+bi where a and b are real numbers and i is the square root of -1
- inner product a real number (a scalar) that is the product of two vectors
- scalar product a real number (a scalar) that is the product of two vectors
- dot product a real number (a scalar) that is the product of two vectors
- irrational number a real number that cannot be expressed as a rational number