It gives them a wrong mental model of rank, which they must unlearn
later. This can have serious consequences, particularly if they get
the idea that u"n is 'like u with the rank set to n' (if that were true,
u"1"_1 would be the same as u"_ 1, which it isn't).
Ken thought you should learn J like you learn a natural language, by
seeing and saying, and creating your own rules internally. I think he
was wrong when it comes to verb rank. The idea is so new, and so
subtle, that users left to themselves get it wrong. I had one very
bright student who, discovering that (,1) + 1 2 3 gave an error, found
that +/ would not give an error, and ever after applied / to every
verb. He created his own rule, you see.
Henry Rich
On 1/17/2021 12:24 AM, Raul Miller wrote:
Does it really cost them that much?
Given that beginner problems generally do not involve multi-megabytes
of data, I mean...
Thanks,
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