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

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**{7/3}****Member**- Registered: 2013-02-11
- Posts: 210

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.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 88,589

Hi {7/3};

Welcome to the forum!

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,466

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 (2013-03-05 09:05:10)*

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

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,600

Hi {7/3}

Welcome to the forum!

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

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**{7/3}****Member**- Registered: 2013-02-11
- Posts: 210

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.

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,466

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

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