Peter
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 Nov5 awarded Notable Question May18 awarded Nice Question Mar18 awarded Popular Question May15 awarded Commentator May15 accepted relationship of polar unit vectors to rectangular May15 comment relationship of polar unit vectors to rectangular OK, this is a good clue. I'm getting the picture that if I move forward and learn about transformations between the coordinate systems (as Brady mentions above) I may be able to come back at that time and understand this. So thank you guys. May15 comment relationship of polar unit vectors to rectangular Thanks for the pointers to related concepts - I will look further into this. In context, the author is contrasting the Cartesian unit vectors $\hat{i}$ and $\hat{j}$ with the 2D Polar unit vectors $\hat{r}$ (radius) and $\hat{\theta}$ (degrees from x-axis). Immediately before the 2 equations he says "An important consequence [of the definition of polar unit vectors] is that the directions of $\hat{r}$ and $\hat{\theta}$ will be different at different locations...the dependence of the polar unit vectors on position can be seen in the following relations:" Thanks again for your help. May15 comment relationship of polar unit vectors to rectangular hm, that's what it says here - a misprint? May14 asked relationship of polar unit vectors to rectangular Feb4 comment super-basic algebra - solve equation Thanks very much - I was trying to factor then add inverses, I had the process backwards. Cheers! Feb4 accepted super-basic algebra - solve equation Feb4 asked super-basic algebra - solve equation Jun11 comment Set theory puzzles - chess players and mathematicians Thanks very much for the help you guys! Jun11 accepted Set theory puzzles - chess players and mathematicians Jun11 asked Set theory puzzles - chess players and mathematicians Feb15 accepted Derivation of rules pertaining to group $S_{3}$, from Artin's Algebra 2e Feb15 comment Derivation of rules pertaining to group $S_{3}$, from Artin's Algebra 2e Got it - thanks. Feb15 asked Derivation of rules pertaining to group $S_{3}$, from Artin's Algebra 2e Jan26 awarded Fanatic Dec14 answered Intuition around why Sine of X angle always equals same result.