自然対数の底

e = 2.71828 18284 59045 23536 02874 71352

Euler’s number & the exponential function
5^1 = 5, 5^0 = 1, 5^-2= 1/25, 5^1/2= √5, 5^3*5^4=5^7, (5^3)^4=5^12