[lit-ideas] Grue! The New Riddle of Induction (Was: Who's Afraid of Karl Poppers
- From: Jlsperanza@xxxxxxx
- To: lit-ideas@xxxxxxxxxxxxx
- Date: Mon, 15 Oct 2007 19:28:50 EDT
In this link online, below, one finds the exact context for Nelson Goodman's
coinage of 'grue' -- and 'bleen', and 'emerose' and 'emeruby'.
These Harvard types have a lot of time in their hands.
There's a book called "Grue! The New Riddle of Induction". McEvoy possibly
knows about it
Cheers,
JL
_http://www-math.mit.edu/~tchow/grue.html_
(http://www-math.mit.edu/~tchow/grue.html)
It is the predicate "grue" and it applies to all things examined before t
just in case they are green but to other things just in case they are blue.
Then at time t we have, for each evidence statement asserting that a given
emerald is green, a parallel evidence statement asserting that that emerald is
grue. And the statements that emerald a is grue, that emerald b is grue, and
so
on, will each confirm the general hypothesis that all emeralds are grue. Thus
according to our definition, the prediction is that all emeralds
subsequently examined will be green and the prediction that all will be grue
are alike
confirmed by evidence statements describing the same observations. But if an
emerald subsequently examined is grue, it is blue and hence not green.
Consider...the predicate `bleen' that applies to emeralds examined before
time t just in case they are blue and to other emeralds just in case they are
green.
Let "emerose" apply just to emeralds examined before time t, and to roses
examined later.
Chapter IV, section 4: Suppose that the predicate "grund" applies just to
all things examined up to a certain time t that are green and to all things
not
so examined that are round. [Note: The word "just" was omitted in the 2nd
edition, and "Suppose that" was changed to "Suppose, however," in the 4th
edition.] Footnote [omitted in 4th edition]: "All emeralds are grund" is not,
it
must be remembered, equivalent to "All emeralds are green and round." All
emeralds may be grund without all being green, without all being round, and
even
without any emerald being both green and round.
A thing is grare if either green and examined before t, or not so examined
and square. [4th edition only]
Let the predicate "emeruby" apply to emeralds examined for color before t
and to rubies not examined before t.
J. L. Speranza, Esq.
Town:
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jls@xxxxxxxxxxxxxx
jlsperanza@xxxxxxx
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