** Summary **

One of the styles for writing expressions, with operations '''in-between''' the
operands (e.g. `6 * 7`), as contrasted to ''postfix'' (e.g. `6 7 *`; operations
follow operands, as in [RPN]) and ''prefix'' (e.g. `* 6 7`; operations come
before operands, as in [Tcl] in general). Infix notation for mathematical
expressions is by far the most common, and is in Tcl supported by [expr].


** See Also **

   `[[[expr]]`:   
   [infix]:   

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