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**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,600

New Page: Finding Maxima and Minima using Derivatives

Please let me know what you think, anything I may have got wrong, suggestions, etc,

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

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,501

hi MathsIsFun,

Good page, thanks.

When I was at school, my teacher wrongly called a saddle point, a 'point of inflexion' and I think this confusion is widespread. Would you be able to add a footnote about inflexion (or inflection if you prefer) to clarify ?

http://en.wikipedia.org/wiki/Point_of_inflexion

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

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,219

Hi MIF;

Good page. Please expand on the inflection points if you have the time.

**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.**

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

Hi MIF

Nice page.

You can maybe add that the better way of finding out if an extremum is a maximum or a minimum is looking at the sign changes at the zeros of the first derivative. It works for any function continuous between the two zeros.

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.

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**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,600

Thanks Guys! Good suggestions all.

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

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**Brainwave****Member**- Registered: 2013-12-10
- Posts: 2

Bobbym I love your words " if you cannot overcome with talent, overcome with efforts."

"MATHEMATICS", the birth place of great THINKERS.

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**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,600

Wrote a page on Inflection Points ... created new topic for you guys to comment on: http://www.mathisfunforum.com/viewtopic.php?id=20306

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

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