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## #1 2013-02-12 03:51:29

{7/3}
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### Hello!

Hello,I am a new user.I am a curious boy,if I see something new I try to learn about it.I intend to learn and help about math from this forum,thank you for your time.May all your lives' second differential be negative.

There are 10 kinds of people in the world,people who understand binary and people who don't.

## #2 2013-02-12 03:54:42

bobbym

Online

### Re: Hello!

Hi {7/3};

Welcome to the forum!

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #3 2013-02-12 06:10:04

bob bundy
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### Re: Hello!

hi {7/3}

Welcome to the forum.

#### {7/3} wrote:

May all your lives' second differential be negative.

Are you sure?  I think that means it's all down hill from here.

Bob

Last edited by bob bundy (2013-03-06 08:05:10)

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

## #4 2013-02-12 06:16:19

anonimnystefy
Real Member

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### Re: Hello!

Hi {7/3}

Welcome to the forum!

The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

## #5 2013-02-12 12:23:40

{7/3}
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### Re: Hello!

I meant,if first derivative is 0 and second derivative is -ve the point is local mamimum.Also if 2nd derivative is -ve for any x,y and z between them,(z,f(z)) is over the secant line of (x,f(x)) and (y,f(y)).

There are 10 kinds of people in the world,people who understand binary and people who don't.

## #6 2013-02-12 19:07:49

bob bundy
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### Re: Hello!

hi {7/3}

How are you today?

Doesn't it depend on where the points x, y, and z lie?

Bob

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