The Euler-Mascheroni constant is a number that appears in analysis and number theory. It first appeared in the work of Swiss mathematician Leonhard Euler in the early 18th century. It is usually represented with the Greek letter, , although Euler used the letters C and O instead. It is not known yet whether the number is irrational (which would mean that it cannot be written as a fraction with an integer numerator and denominator) and/or transcendental (which would mean that it is not the solution of a polynomial with integer coefficients). The numerical value of is about . Italian mathematician Lorenzo Mascheroni also worked with the number, and tried, unsuccessfully, to approximate the number to 32 decimal places, making mistakes on five digits.