On 9/5/2018 6:43 PM, Jose Mario Quintana wrote:
My understanding is that the sentence,

    (;:'+/')@.0 1
+/

is legal (i.e., sanctioned by the dictionary).  You apparently think it is
not legal.  Why?
[email protected] is different from [email protected] because [email protected] must be a verb and thus must produce noun results when applied to nouns; that is why every box of m in [email protected] must be the AR of a verb.

[email protected] need not produce a verb & thus it is OK for that m to contain non-verb ARs.  By my reading, such an m is not a gerund.

non-verb ARs are also not allowed as left operands to `: .

We need a word for "something that can be the m in [email protected]" and it seems clear to me that "gerund" is it.

Henry Rich

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