help me! Q=D={x|x is an integer such that x^2=2)

caspertts · 2014-05-09 22:36:07

first of all, hello I'm new here and I'm not good in math so I decided to join this forum,hope we can help each other!

this is the question that I don't know the answer

D={x|x is an integer such that x^2=2)
list the elements of D

if I √2, I will not get the value of x in integer isn't?

zetafunc. · 2014-05-09 22:48:20

caspertts wrote:

if I √2, I will not get the value of x in integer isn't?

So what can you say about the set, D?

caspertts · 2014-05-09 22:51:59

zetafunc. wrote:

caspertts wrote:
if I √2, I will not get the value of x in integer isn't?
So what can you say about the set, D?

containt no element?

Agnishom · 2014-05-09 22:53:54

The set is

Welcome to the forum;

What is your favorite color?

caspertts · 2014-05-09 23:02:54

Agnishom wrote:

The set is
Welcome to the forum;
What is your favorite color?

thanks!my next question,if

A={1}
D={∅}

then A∩D?

sorry for asking simple question like this , favorite color?blue!

Bob · 2014-05-10 00:27:47

hi caspertts

Welcome to the forum.

A intersection 'phi' is everything in both. But they haven't got any common elements so it's the empty set again.

Have a look here:

http://www.mathsisfun.com/sets/sets-introduction.html

If that's too simple then use the search with the word 'sets' to find lots more.

Bob

Strictly speaking the empty set is { } not {phi}. There is a difference which I'll explain if you want.

Last edited by Bob (2014-05-10 00:30:59)

Agnishom · 2014-05-10 00:37:16

sorry for asking simple question like this

Do not be sorry. All questions are worthy questions.

Yoda wrote:

A fool, no questioner is. By asking, wiser he becomes.

Bob · 2014-05-10 01:07:01

All questions are worthy questions.

I agree with your sentiment but what about:

Is it FALSE to say this question is worthy?

Bob

Agnishom · 2014-05-10 01:18:56

Axiom: All questions are worthy.

Question: Is it FALSE to say this question is worthy?

Answer: No. [by axiom]

Which part of the axiom is contradicted?

Bob · 2014-05-10 05:40:00

I concede your point.

Bob

Agnishom · 2014-05-10 05:44:37

yay!

Bob · 2014-05-10 06:11:02

Don't get too happy. I may yet find a sentence that does what I was intending.

Bob

Agnishom · 2014-05-10 12:25:45

Not necessarily.

There are undoubtedly properties about questions which you cannot prove false.Example: All questions end with a question mark

ShivamS · 2014-05-10 13:37:16

bob bundy wrote:

Don't get too happy. I may yet find a sentence that does what I was intending.
Bob

Bob · 2014-05-10 20:13:51

hi Agnishom,

After much further thought, I find I am able to find any inconsistency or logical flaw in your theory. I therefore hold it to be a good theory.

Do you want to name it? How about "Agnishom's First Worthiness Theory"?

Bob

ShivamS · 2014-05-14 13:17:28

bob bundy wrote:

I find I am able to find any inconsistency or logical flaw in your theory.

Your post does not make sense

Bob · 2014-05-14 19:14:07

O yes. Meant to be 'unable to find'. Whoops.

Bob

Agnishom · 2014-05-14 19:28:26

Can we name it 'Fundamental Theorem of Worth'?

Bob · 2014-05-15 10:15:47

Fundamental Theorem of Worth it is then. Congratulations.

Bob

ShivamS · 2014-05-15 13:01:47

Prove the theorem. I thought it was an axiom.

Bob · 2014-05-20 00:29:13

ShivamS wrote:

Prove the theorem. I thought it was an axiom.

You are right. Let's amend it to: "Fundamental Theory of Worth."

Is that OK ?

Bob

ShivamS · 2014-05-20 00:33:58

It has not been proven. It must be an axiom or a hypothesis.

Bob · 2014-05-20 01:05:19

We have an axiom:

Agnishom wrote:

Axiom: All questions are worthy.

Bob

ShivamS · 2014-05-20 01:06:08

A theory is usually supported by some empirical evidence.

anonimnystefy · 2014-05-20 02:00:45

Not really. Number theory, for example.

Math Is Fun Forum

#1 2014-05-09 22:36:07

help me! Q=D={x|x is an integer such that x^2=2)

#2 2014-05-09 22:48:20

Re: help me! Q=D={x|x is an integer such that x^2=2)

#3 2014-05-09 22:51:59

Re: help me! Q=D={x|x is an integer such that x^2=2)

#4 2014-05-09 22:53:54

Re: help me! Q=D={x|x is an integer such that x^2=2)

#5 2014-05-09 23:02:54

Re: help me! Q=D={x|x is an integer such that x^2=2)

#6 2014-05-10 00:27:47

Re: help me! Q=D={x|x is an integer such that x^2=2)

#7 2014-05-10 00:37:16

Re: help me! Q=D={x|x is an integer such that x^2=2)

#8 2014-05-10 01:07:01

Re: help me! Q=D={x|x is an integer such that x^2=2)

#9 2014-05-10 01:18:56

Re: help me! Q=D={x|x is an integer such that x^2=2)

#10 2014-05-10 05:40:00

Re: help me! Q=D={x|x is an integer such that x^2=2)

#11 2014-05-10 05:44:37

Re: help me! Q=D={x|x is an integer such that x^2=2)

#12 2014-05-10 06:11:02

Re: help me! Q=D={x|x is an integer such that x^2=2)

#13 2014-05-10 12:25:45

Re: help me! Q=D={x|x is an integer such that x^2=2)

#14 2014-05-10 13:37:16

Re: help me! Q=D={x|x is an integer such that x^2=2)

#15 2014-05-10 20:13:51

Re: help me! Q=D={x|x is an integer such that x^2=2)

#16 2014-05-14 13:17:28

Re: help me! Q=D={x|x is an integer such that x^2=2)

#17 2014-05-14 19:14:07

Re: help me! Q=D={x|x is an integer such that x^2=2)

#18 2014-05-14 19:28:26

Re: help me! Q=D={x|x is an integer such that x^2=2)

#19 2014-05-15 10:15:47

Re: help me! Q=D={x|x is an integer such that x^2=2)

#20 2014-05-15 13:01:47

Re: help me! Q=D={x|x is an integer such that x^2=2)

#21 2014-05-20 00:29:13

Re: help me! Q=D={x|x is an integer such that x^2=2)

#22 2014-05-20 00:33:58

Re: help me! Q=D={x|x is an integer such that x^2=2)

#23 2014-05-20 01:05:19

Re: help me! Q=D={x|x is an integer such that x^2=2)

#24 2014-05-20 01:06:08

Re: help me! Q=D={x|x is an integer such that x^2=2)

#25 2014-05-20 02:00:45

Re: help me! Q=D={x|x is an integer such that x^2=2)

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