# [texhax] plain TeX home made symbols for the numbers sets

Rodolfo Medina rodolfo.medina at gmail.com
Sun Jun 28 21:14:18 CEST 2009

In the TeXbook, the symbol for the real numbers set is something like:

${\rm I\!R}$

Then , the symbol for the natural numbers set can be:

${\rm I\!N}$

Can anybody suggest how to get something similar for the integers and rational
numbers sets?

Thanks for any help
Rodolfo