Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

**Sarah Rebekah****Member**- Registered: 2011-09-25
- Posts: 540

We could have a birthday page for members.

Love is the key to life

Offline

**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,000

that seems like a nice idea!

we should have a birthday notifier!

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.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,962

That is! I have a birthday coming up.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

Offline

**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,000

when?

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.

Offline

**Sarah Rebekah****Member**- Registered: 2011-09-25
- Posts: 540

Glad u like i have a brithday comeing up to

Love is the key to life

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,962

Hi anonimnystefy;

In June.

Thanks Sarah.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,527

hi everybody,

I think I've got a theorem here:

Cannot get a 'complement' bar over my set on the same line as the phi.

Bob

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Offline

**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,000

hi bob

why not just use \frac ?

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.

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,527

hi Stefy,

I was try to express the following

The complement of the set {people who have a birthday coming up} = phi = empty set.

You'll notice I was trying to inject some maths into the thread; sorry Sarah Rebekah.

btw Mine's in January.

So I wanted to get a bar over the whole of the set ... tried \bar (put the bar over the letter 'b' in the middle!) and \over (which is how I left it) but then the phi became the top of the fraction. ggrrr! so I put it into two separate lines.

Any suggestions?

Bob

*Last edited by bob bundy (2011-10-14 01:51:33)*

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Offline

**Sarah Rebekah****Member**- Registered: 2011-09-25
- Posts: 540

its ok Bob

Love is the key to life

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,962

I am not sure what all this means.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,527

It means I can do this

Thanks

Bob

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Offline

**Sarah Rebekah****Member**- Registered: 2011-09-25
- Posts: 540

heheheheheheheh

Love is the key to life

Offline

Will you explain the theorem?

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

I'm not crazy, my mother had me tested.

Offline

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,608

People will have to volunteer their birthdays ...

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

Offline

**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,000

I think of it like this-every level of information I give out is a step closer to me. But, I am sure that if you searched through my posts you could find my birth date.

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.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,962

MIF wrote:

People will have to volunteer their birthdays ...

How can we get them to do that? Seems impossible.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

Offline

**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,000

Nobody will be made into that. Thus the use of "volunteer".

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.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,962

Hi anonimnystefy;

Maybe about 5 members would go back and fill in their birthdate. That is probably not enough.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

Offline

**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,000

I think it would be more,but you wouldn't be one of them.

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.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,962

Hmmmm. Who would believe it anyway?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

Offline

**phrontister****Real Member**- From: The Land of Tomorrow
- Registered: 2009-07-12
- Posts: 4,352

I could add credibility to your DOB by including it in your YOB puzzle, Bobby!

"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do." - Ted Nelson

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,962

Hi;

Yes, you could. But who could solve it? I am still having major problems.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,527

But who could solve it?

Somewhere in the multiverse I have solved it. In fact I did it five years before it was set!

Unfortunately, I haven't found a way to communicate with any of the infinite number of other selves that exist in all these universes so I am unable to profit from this information in this universe.

The really annoying thing is: in at least one of those universes a 'Bob' has worked out how to communicate across universes. Why isn't he doing so?

Bob (this universe version)

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Offline

**phrontister****Real Member**- From: The Land of Tomorrow
- Registered: 2009-07-12
- Posts: 4,352

Now, that's jolly interesting! It could very well explain the odd feeling I got when the person who solved my puzzle communicated their M solution to me. It seemed that they knew 'my' puzzle better than I did: that they might even be its *original *author, and that I, in this universe, am merely a subsequent author.

I may, then, have received a surreptitious www visit from another me! If we're a replication or a parallel existence of another life in some other universe within a multiverse, I'd draw the conclusion that one day I'll know much more M than I do now!!

"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do." - Ted Nelson

Offline