On 5/30/2012 12:06 AM, meekerdb wrote:
On 5/29/2012 8:47 PM, Stephen P. King wrote:
On 5/29/2012 5:18 PM, Jesse Mazer wrote:



On Tue, May 29, 2012 at 4:38 PM, Aleksandr Lokshin <aaloks...@gmail.com <mailto:aaloks...@gmail.com>> wrote:

    It is impossible to consider common properties of elements of an
    infinite set since, as is known from psycology, a man can
    consider no more than 7 objects simultaneously.


That's just about the number of distinct "chunks" of information you can hold in working memory, so that you can name the distinctive features of each one after they are removed from your sense experience (see http://www.intropsych.com/ch06_memory/magical_number_seven.html ). But I'm not talking about actually visualizing each and every member of an infinite set, such that I am aware of the distinctive features of each one which differentiate them from the others. I'm talking about a more abstract understanding that a certain property applies to every member, perhaps simply by definition (for example, triangles are defined to be three-sided, so three-sidedness is obviously one of the common properties of the set of all triangles). Do you think it's impossible to have an abstract understanding that a large (perhaps infinite) set of objects all share a particular property?

A single finite and faithful (to within the finite margin of error) representation of "triangle" works given that definition. This is there nominalism and universalism come to blows....


    Your remarkable objection that "*if two mathematicians consider
    two different arbitrary objects they will obtain different
    results"* demonstrates that you are not a mathematician.


Huh? I didn't write the phrase you put in quotes, nor imply that this was how *I* thought mathematicians actually operated--I was just saying that *you* seemed to be suggesting that mathematicians could only prove things by making specific choices of examples to consider, using their free will. If that's not what you were suggesting, please clarify (and note that I did ask if this is what you meant in my previous post, rather than just assuming it...I then went on to make the conditional statement that IF that was indeed what you meant, THEN you should find it impossible to explain how mathematicians could be confident that a theorem could not be falsified by a new choice of example. But of course I might be misunderstanding your argument, that's why I asked if my reading was correct.)

    Arbitrary element is not an object, it is a  mental but
    non-physical process  which*enables one to do a physically
    impossible thing : to observe an infinite set of objects
    simultaneously* considering then all their common properties at
    a single really existing object. Therefore two different
    mathematicians will necessarily obtain the same result.


So you agree mathematicians don't have to make an actual choice of a specific element to consider? Then how is free will supposed to be relevant if there is no actual choice whatsoever being made?

--
Why do you keep insisting on a "specific" property to the "choice" while being shown that the a priori "specificity" itself that is prohibited by the definition.

He didn't refer to a specific property but to a specific choice of element, which is what Loskin says entails the magic ability to select one among an infinite number. He apparently thinks of it like the complement of the axiom of choice: to pick an element you need to say,"Not this one. Not this one. Not..." an infinite number of times.

Hi Brent,

Yes, that is a very good point! The axiom of choice is a suspect here. Banach and Tarsky proved a paradox of the axiom of choice, it is the "scalar field" of mathematics, IMHO; you can get from it anything you want.



The point is is that what ever the choice is, there are ab initio alternatives that are not exactly known to be optimal solutions to some criterion and some not-specified-in-advance function that "picks" one.

??? The function is specified in advance, e.g. "triangles" is a function that picks out things with three sides meeting pairwise as three vertices. But I have no idea what you mean by "optimality".


What does that word mean? Try this from http://encyclopedia2.thefreedictionary.com/Optimality

*1.* (mathematics) *optimal* - Describes a solution to a problem which minimises some cost function. Linear programming <http://encyclopedia2.thefreedictionary.com/Linear+programming> is one technique used to discover the optimal solution to certain problems. *2.* (programming) *optimal* - Of code: best or most efficient in time, space or code size.


    Is that helpful?

--
Onward!

Stephen

"Nature, to be commanded, must be obeyed."
~ Francis Bacon

--
You received this message because you are subscribed to the Google Groups 
"Everything List" group.
To post to this group, send email to everything-list@googlegroups.com.
To unsubscribe from this group, send email to 
everything-list+unsubscr...@googlegroups.com.
For more options, visit this group at 
http://groups.google.com/group/everything-list?hl=en.

Reply via email to