The zero and the one*

As one less one stops straight at none

1 - 1 = 0
0 + 1 = 1
1 - 0 = 1
1 + 1 = 2

At twelve seven less I think I see a seven less five (two less) -- leave
three

2/1 1/1 3/2
1/1 3/2 4/3
3/2 4/3 7/5

Dan

*Though there's something to be said for just going to sleep when your
tired - it doesn't always work out that way... And while a bad poem isn't a
good poem, perhaps a math poem ain't even a poem!