In math mode, something like $if f x > 3 then 42 else y$ typesets to this: $if f x > 3 then 42 else y$

Obviously, spacing is wrong here, and I need to correct manually: $if \: f \: x > 3 \: then \: 42 \: else \: y$ typesets to enter image description here

  1. Which is the correct amount of space to insert?
  2. Is there a way to automate this process, i.e. automatically insert a space between "words" separates by spaces in the source?
  • 1
    Please read some LaTeX tutorial before you start typing, e.g., tobi.oetiker.ch/lshort/lshort.pdf chapter 3.
    – Alex
    Jun 2 '13 at 12:59
  • I'm not new to LaTeX - just new to functional-programming-style expressions in math mode :-)
    – fefrei
    Jun 2 '13 at 13:19

the spacing is the least of the problems, the letters are all wrong as well. The math italic font has wide side-bearings specifically so that adjacent letters do not look like letters forming a word but rather the usual mathematical use as implied multiplication of separate variables. To use a multi-letter identifier you need to use a text font, then inter-word spacing will automatically work as well, although you would need to use \quad or a similar space if embedding the text in math mode..

if  $f x > 3$  then $42$  else $y$ 

or if you need to embed it in display math

\[ \textrm{if} \quad f x > 3 \quad \textrm{then} \quad 42  \textrm{else} \quad y \]
  • Which spacing would you use for $f x$?
    – fefrei
    Jun 2 '13 at 12:55
  • @felix-freiberger: What is f x? Do you mean f(x)? Jun 2 '13 at 12:56
  • @felix-freiberger sorry I dropped the f by mistake, babara just put them back so see edited answer. Jun 2 '13 at 12:57
  • f x is a functional application in a functional programming language like Haskell.
    – fefrei
    Jun 2 '13 at 12:58
  • @felix-freiberger either fx as above or perhaps \mathop{f{}}x which would give the same spacing as a mult-letter identifier like \log Jun 2 '13 at 13:02

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