newbie: how to define, typeset a multi-rule function?

*To*: mathgroup at smc.vnet.net*Subject*: [mg96767] newbie: how to define, typeset a multi-rule function?*From*: Tom Roche <tlroche at gmail.com>*Date*: Tue, 24 Feb 2009 05:46:36 -0500 (EST)

As advertised by the Subject:, I'm new to Mathematica (specifically 7.0.0 for Students for 32-bit Windows on XP Pro) so please excuse any lapses in terminology. I'd also appreciate pointers to specific docs rather than just an RTFM. I suspect in this case I just need to know what the appropriate term is for what I'm trying to create. However I've tried searching the docs for various permutations of multi-rule or multi-line function, and even googling, to no avail. I'm trying to create a notebook that typesets a particular mathematical function, and then solves it. The function has 2 parts or rules: it returns k (a constant) for one part of its domain, and 0 otherwise. This is typically typeset with the function name and the equals sign on one line, then a large left curly bracket (or brace) centered on that line, then each rule on a separate line with all the rule lines to the right of the bracket. For an example in a math layout, I can almost typeset the function in OpenOffice Math like f_x(%chi) = left lbrace stack {k if %chi in [0,1] # 0 otherwise} right rbrace (except that I don't want the closing brace, but that's another problem). I tried to create this using the palettes, but I didn't see one that did multiline brackets. What do I need to use? Once I've typeset this function, I want to actually solve it. How does one create a function with multiple rules in Mathematica? TIA, Tom Roche <Tom_Roche at pobox.com>

**Follow-Ups**:**Re: newbie: how to define, typeset a multi-rule function?***From:*DrMajorBob <btreat1@austin.rr.com>