There's a Delta for Every Epsilon

看了http://spikedmath.com/500.html
底下评论里提到的那首歌，作者Tom Lehrer就是写和唱元素周期表之歌的那个哥们。
歌词如下:
ARTIST: Tom Lehrer
TITLE: There's a Delta for Every Epsilon
Lyrics:
There's a delta for every epsilon
It's a fact that you can always count upon
There's a delta for every epsilon
And now and again
There's also an N
But one condition I must give
The epsilon must be positive
A lonely life all the others live
In no theorem
A delta for them
How sad, how cruel, how tragic
How pitiful, and other adjec-
Tives that I might mention
The matter merits our attention
If an epsilon is a hero
Just because it is greater than zero
It must be mighty discouragin'
To lie to the left of the origin
This rank discrimination is not for us
We must fight for an enlightened calculus
Where epsilons all, both minus and plus
Have deltas
To call their own
Utube上的视频只截取了这一首，完整的版本这里有:http://archive.org/details/lehrer，这首2:40开始。