Hi Raul,
You say:
"So if [ and ] were exact replacements for x and y,
Skip's example would be syntactically invalid.
But y is a noun -- it is not a verb."
Do you see the contradiction here?
I am not saying that y as a noun is replaced by another noun. I am
saying that it is replaced by the noun phrase "]y" which produces the same
result in this situation. To make the inclusion of y implicit, the y is
removed, Thus the symbol "y" is replaced by the symbol "]" - but this
doesn't mean that the noun y is replaced by a noun "]". This is identical to
the way Skip is doing it in tacit J. He too is replacing a symbol "y" with a
verb "]", but he can do that because a noun implicitly follows the verb "]".
Don
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