Re: double-lined Z for meaning "integers"

[Hans Hagen <pragma@wxs.nl>]

At 12:15 09/09/2003 -0400, you wrote:
>Hi.  I am having trouble finding the right incantation for summoning
>the correct Z.  There are some doubly-lined versions of N, Z, Q, and
>R, that are used often to signify the sets of natural numbers,
>integers, rational numbers, and reals, respectively.
>
>Does anyone know how to get those?  Here's a pic of the Z and Q.  Note
>that there's white between the lines -- not fill.
>
>
>                                  -----
>     -------------------        -/     \-
>                 /    /        /       | \
>                /    /        /        |  \
>               /    /        /         |   \
>               |   /         |         |   |
>              /    |        /          |    \
>             /    /         |          |    |
>            /    /          |          |    |
>           /    /           |          |    |
>          /    /            \          |    /
>         /    /              |         |   |
>         |    |              \         |   /
>        /    /                \        \  /
>       /    /                  \       |\-
>      /    /                    -\     /- \
>     -------------------          -----    \


math-tex defined:

\definemathcommand [integers]       {\mfunction{Z}}
\definemathcommand [reals]          {\mfunction{R}}
\definemathcommand [rationals]      {\mfunction{Q}}
\definemathcommand [naturalnumbers] {\mfunction{N}}
\definemathcommand [complexes]      {\mfunction{C}}
\definemathcommand [primes]         {\mfunction{P}}

support for blackboard letters depends on the fonts you use, so math-ams 
defined:

\definemathcommand [integers]       {\blackboard{Z}}
\definemathcommand [reals]          {\blackboard{R}}
\definemathcommand [rationals]      {\blackboard{Q}}
\definemathcommand [naturalnumbers] {\blackboard{N}}
\definemathcommand [complexes]      {\blackboard{C}}
\definemathcommand [primes]         {\blackboard{P}}

so .. if you use the ams fonts, $\integers$ and $\rationals$ should work

Hans
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