Math Is Fun Forum

dangermulan1988

Member

Registered: 2011-06-11

Posts: 18

questions about elements in sets ...

please delete

Last edited by iwan_ccie (2011-07-11 01:38:57)

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: questions about elements in sets ...

hi iwan_ccie

the given set has two elements:

one of them is 9,
the other one is the set {1,2,{3},{4,5},6,{{7},8}}

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“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

dangermulan1988

Member

Registered: 2011-06-11

Posts: 18

Re: questions about elements in sets ...

But in this set .... {1,2,{3},{4,5},6,{{7},8}}
You can take more elements right?

Like this:

SET = {{1,2,{3},{4,5},6,{{7},8}},9}
- Element 1 = set {1,2,{3},{4,5},6,{{7},8}}
- Element 2 = number 9

The set that is actually an element = {1,2,{3},{4,5},6,{{7},8}}
- Element 1 = set {3}
- Element 2 = set {4, 5}
- Element 3 = set {{7}, 8}
- Element 4 = number 1
- Element 5 = number 2
- Element 6 = number 6

This set also had an element that has multiple sets = {{7}, 8}
- Element 1 = {7}
- Element 2 = number 8

So if we count all the elements the answer is 10 elements in total or am I wrong here ...

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: questions about elements in sets ...

hi iwan_ccie

the elements you counted are subsets and subsubsets of our set but they are not counted as elements of our set.

---

“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

dangermulan1988

Member

Registered: 2011-06-11

Posts: 18

Re: questions about elements in sets ...

I guess that this has to do with how the question is asked ...
- What are is the total of elements that you can get from the following set?
- How many elements can you get from this set?

Right?

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: questions about elements in sets ...

Hi;

http://en.wikipedia.org/wiki/Element_%28mathematics%29

Near the top. anonimnystefy is correct.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: questions about elements in sets ...

hi iwan_ccie and bobbym

here's the stuff you need from the link bobbym mentioned in his post:
" For example consider the set B = {1, 2, {3, 4}}. The elements of B are not 1, 2, 3, and 4. Rather, there are only three elements of B, namely the numbers 1 and 2, and the set {3, 4}."

---

“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

dangermulan1988

Member

Registered: 2011-06-11

Posts: 18

Re: questions about elements in sets ...

thanks :-)
I already did a search and also  looked on wikipedia ...
But I was just thinking to hard ... and tought what if they are asking ... to just count all the elements ... the maximum possible ways ...
But I understand that there are only 2 elements in the set given:

SET = {{1,2,{3},{4,5},6,{{7},8}},9}
-    Element 1 = set {1,2,{3},{4,5},6,{{7},8}}
-    Element 2 = number 9

Last edited by iwan_ccie (2011-07-06 04:18:14)

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: questions about elements in sets ...

hi iwan_ccie

your welcome.glad you understood.

---

“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.