[isabelle] Fun vs Primrec: difference?
Hi people out there,
New beginner here, and so beginner's questions :-P
My first one: what's the difference between “fun” and “primrec” please ?
Both looks similar or synonymous, but surprisingly, when Main is not
imported (yes, I know it should, but that's for testing), “fun” seems not
“Syntactic sugar causes cancer of the semi-colons.” 
“Structured Programming supports the law of the excluded muddle.” 
: Epigrams on Programming — Alan J. — P. Yale University
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