25May
1 Wikipedia173606
About The Number 1 It is also the first and second numbers in the Fibonacci sequence, and is the first number in many mathematical sequences. In Principia Mathematica, 1 is defined as the set of all singletons. Sometimes, tallying is referred to as "base 1," since only one mark (the tally) is needed, but this is not a positional notation. Where 1win the 1 is written with a long upstroke, the number 7 has a horizontal stroke through the vertical...