hi,

What is the different between 'in beta normal form' and 'has beta normal

form' ? Does the former means the current form of the term is already in

normal form but the latter means that it is not a normal form yet and can be

reduced to be normal form? Like \x.x is in NF and (\x.x) (\x.x) has NF?

If above is true, I am confused why we have to distinguish the terms which

have NF and be in NF? isn't the terms have NF will eventually become in NF?

or there are some way to avoid them becoming in NF?

Thanks

Alg

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