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

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#1 2013-02-11 04:51:29

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

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.

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#2 2013-02-11 04:54:42

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 84,657

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.

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#3 2013-02-11 07:10:04

bob bundy
Moderator
Registered: 2010-06-20
Posts: 6,311

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.  eek  smile

VvDlvlz.gif

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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#4 2013-02-11 07:16:19

anonimnystefy
Real Member
From: The Foundation
Registered: 2011-05-23
Posts: 15,400

Re: Hello!

Hi {7/3}

Welcome to the forum! smile


“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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#5 2013-02-11 13:23:40

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

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.

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#6 2013-02-11 20:07:49

bob bundy
Moderator
Registered: 2010-06-20
Posts: 6,311

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

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