45 pairs............................90 numbers..............10 - 99............all double digit numbers period.........sum to 4905..........................like 7 * 7................7 * 7 = 49...............2 + 3 + 5 + 7 = 17................11 + 13 + 17 + 19 = 60...............60 + 17 = 77..............7 * 7 = 49..............7 + 7 = 14.........like 14i............109.....................1/9 + 1/10...........the 1st jump in the harmonic series......from single digit denominators to double digit denominators.............9 + 10 = 19..................1 + 1 = 2...........2 + 19 = 21............like 21i........................4 numbers..........................1/4 = 0.25...................1/4th the c plane.....90 degrees......................add straight across..........of 1/9 and 1/10.........1 + 1 = 2.......like a 45/45 degree right triangle......1 : 1..........and the square root of 2..................of 2 - 11.......one of the two prime fundamentals................................9 + 10...................1 - 9........9 numbers...........0 - 9........10 numbers........single digit counting numbers...........and all single digit numbers.........



square root(2) =

1.41421356237