## Saturday, January 29, 2011

### Knuth quote III

Here's a great one from the source code to TeX. It's the beginning of section 1154.
The simplest math formula is, of course, ‘\$ \$’, when no noads are generated. The next simplest cases involve a single character, e.g., ‘\$x\$’. Even though such cases may not seem to be very interesting, the reader can perhaps understand how happy the author was when ‘\$x\$’ was ﬁrst properly typeset by TeX.
Being a programmer myself, I most certainly can.

A noad, by the way, is what TeX calls (most of) the elements of a math list. (It can also contain nodes, which are what appear in horizontal and vertical lists.)

#### 1 comment:

1. Thanks for sharing this!

And it reminds me an old math joke: what is the happiest period in a mathematician's life? Between finishing the proof and finding the first error.