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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
- Administrator
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Re: Hello!
Hi {7/3};
Welcome to the forum!
In mathematics, you don't understand things. You just get used to them.
90% of mathematicians do not understand 90% of currently published mathematics.
I am willing to wager that over 75% of the new words that appeared were nothing more than spelling errors that caught on.
#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
“A secret's worth depends on the people from whom it must be kept.” ― Carlos Ruiz Zafón
#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
- Moderator
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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