Head Normal Form

<theory, reduction> (HNF) A term describing a lambda expression whose top level is either a variable, a data value, a built-in function applied to too few arguments, or a lambda abstraction whose body is not reducible. I.e. the top level is neither a redex nor a lambda abstraction with a reducible body.

An expression in HNF may contain redexes in argument postions whereas a normal form may not.

Compare Weak Head Normal Form.


Last updated: 2003-01-08

Nearby terms:

Head Disk Assembly | header | Head Normal Form | head normalisation theorem | heads down
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