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seen Aug 10 at 23:51

May
18
awarded  Nice Question
Mar
18
awarded  Popular Question
May
15
awarded  Commentator
May
15
accepted relationship of polar unit vectors to rectangular
May
15
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.
May
15
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.
May
15
comment relationship of polar unit vectors to rectangular
hm, that's what it says here - a misprint?
May
14
asked relationship of polar unit vectors to rectangular
Feb
4
comment super-basic algebra - solve equation
Thanks very much - I was trying to factor then add inverses, I had the process backwards. Cheers!
Feb
4
accepted super-basic algebra - solve equation
Feb
4
asked super-basic algebra - solve equation
Jun
11
comment Set theory puzzles - chess players and mathematicians
Thanks very much for the help you guys!
Jun
11
accepted Set theory puzzles - chess players and mathematicians
Jun
11
asked Set theory puzzles - chess players and mathematicians
Feb
15
accepted Derivation of rules pertaining to group $S_{3}$, from Artin's Algebra 2e
Feb
15
comment Derivation of rules pertaining to group $S_{3}$, from Artin's Algebra 2e
Got it - thanks.
Feb
15
asked Derivation of rules pertaining to group $S_{3}$, from Artin's Algebra 2e
Jan
26
awarded  Fanatic
Dec
14
answered Intuition around why Sine of X angle always equals same result.
Dec
9
answered How to not make mistakes like ($4-20=16$) and other simplistic errors? I've lost 40% of the exam because of this :s