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No book I've ever used has used the term 'vertices' to describe what I've always seen referred to as local maxima and minima.
Other than that...cake. Although being a graduate student, my math skills are constantly being honed.
I was discussing with my mother a simulation program I was writing, when she asked my over the phone if it 'involved algebra'... I answered that everything I have done for the last 4 years has involved 'algebra' at every waking moment. It blows my mind that there can be (and were, when I was graduating high school) young people who could not solve simultaneous algebraic functions or take a derivative of a function. Or be able to sketch what y=x^2 looks like on a napkin.
Basic stuff. And knowing how to apply differential calculus to things in life can never be considered to NOT be useful. It sickens me that, at my (public) high school some years ago... 95% of my graduating class never took Calculus. Because they didn't have to. While I was in Calculus 1 class in high school (with 6 other people), 95% of everyone else was taking Home economics or Gym or something else... enough to just get by...
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