Question: Hi everyone, could I get some help for this question, this question is regard to lambda calculus, finding to normal form. My understanding the normal

Hi everyone, could I get some help for this question, this

Hi everyone, could I get some help for this question, this question is regard to lambda calculus, finding to normal form.

My understanding the normal form is the expression that can no longer go through the beta-reduction. so my question is why the 1st answer is NOT the correct answer? The 3rds one is the correct answer is it because it will give the exactly same expression after the beta-reduction?

it will be nice if you can explain each answer more detailed.

Many thanks!

An expression that cannot be reduced to an expression in normal form in any number of steps is x.x (x.x)x (x.xx)(x.xx) (x.x)(x.x)

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