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Topic: Mathematics as a language
Replies: 35   Last Post: Nov 8, 2010 1:53 AM

 Messages: [ Previous | Next ]
 James Dolan Posts: 143 Registered: 7/17/06
Re: Mathematics as a language
Posted: Nov 6, 2010 3:11 AM

in article <4CD4EFCA.B10CF99C@gmail.com>, herbzet <herbzet@cox.net> wrote:

|I guess the problem people are having with my thesis is that they are
|willing to accept (a) the mathematical existence of S, similar to
|that of the object 6, and they are willing to accept (b) the
|mathematical existence of a bijection f from w_1 to P(N), similar to
|that of the object 6, but they are not willing to accept both (a) and
|(b), because the object 6 is special -- it really and truly exists in
|some sense, and that property of really existing cannot be shared by
|contradictory objects like S and f.
|
|One thinks of sets as collections of objects, and one supposes that
|the collection P(N) either has an uncountable subset S not
|equipollent to P(N), or it doesn't -- there's a fact of the matter
|about collections of objects. One of the objects S or f has an
|existence at least as factual as that of the object 6, and the other
|doesn't -- though the other may enjoy some sort of hypothetical
|existence, not as real as the object 6.
|
|I'm thinking that this is the reason for the caviling about the
|mathematical existence of logically possible objects: some
|mathematical objects are accepted as really existing in some sense --
|they compose the actual mathematical universe.
|
|Whereas, though we may reason about hypothetical, logically possible,
|but non-existent objects, they are not part of the actual
|mathematical universe; not like integers and real numbers,
|quaternions and the square root of -1, and so on. And sets.

no, it's much simpler than that. you're pointing to an actor playing
the tooth fairy and you're saying "i guess that you're telling me that
this actor doesn't exist.". no, we're telling you that the tooth
fairy doesn't exist.

--

jdolan@math.ucr.edu

Date Subject Author
11/2/10 Aatu Koskensilta
11/3/10 herb z
11/3/10 Herman Jurjus
11/3/10 Marshall
11/3/10 Herman Jurjus
11/4/10 herb z
11/4/10 Marshall
11/5/10 herb z
11/5/10 Herman Jurjus
11/6/10 herb z
11/6/10 James Dolan
11/6/10 Tim Little
11/6/10 Daryl McCullough
11/6/10 Marshall
11/6/10 Brian Chandler
11/6/10 Tim Little
11/7/10 lwalke3@lausd.net
11/8/10 Brian Chandler
11/7/10 herb z
11/7/10 Daryl McCullough
11/8/10 herb z
11/3/10 lwalke3@lausd.net
11/3/10 Marshall
11/4/10 herb z
11/4/10 herb z
11/4/10 herb z
11/3/10 Daryl McCullough
11/4/10 Bill Taylor
11/4/10 Daryl McCullough
11/5/10 herb z
11/4/10 herb z
11/4/10 Daryl McCullough
11/5/10 herb z
11/5/10 Daryl McCullough
11/4/10 VK