\[Piecewise]
• Alias: pw.
• Prefix operator with built-in evaluation rules.
• is by default interpreted as Piecewise[{{, }, {, }}].
• Extensible character.
• Not the same as keyboard {.
• See Section 3.10.1.
Usage
Notes
pw. 
is by default interpreted as Piecewise[{{
, 
}, {
, 
}}]. 
