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.
]]>Good page. Please expand on the inflection points if you have the time.
]]>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
]]>Please let me know what you think, anything I may have got wrong, suggestions, etc,
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