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Jul
8
accepted How to finding permutations where some elements repeat?
Jul
8
comment How to finding permutations where some elements repeat?
Oh I get it, because while a repeating element like {1, 1} have N "inner" permutations, there are many places where this can occur, in this example, position [1 2], position [1 3] and position [2 3]. And since these inner permutations don't count, they effectively increased the total permutation count by N times. Thanks a lot!
Jul
8
comment How to finding permutations where some elements repeat?
Thank you for the fast reply! I think I'm beginning to understand... but why is it divide by the "inner" permutations and not minus the "inner" permutations?
Jul
8
asked How to finding permutations where some elements repeat?
Sep
24
awarded  Autobiographer
Feb
12
awarded  Notable Question
Apr
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awarded  Popular Question
Jun
21
awarded  Commentator
Jun
21
comment Deriving Taylor series for function from geometric series
@J.M. I don't actually know how to expand it, it's just given to me and I memorized it.
Jun
21
comment Deriving Taylor series for function from geometric series
@J.M. Sorry but i don't get it. The last few questions I have been doing is more along the lines of $\frac{1}{3-2z}$ with center at 1. which rearranges to $$\frac{1}{1-2(z-1)}$$ which looks very similar to the geometric series $$\frac{1}{1-z}$$. I substitute 2(z-1) into z from geometric series and get my answer.
Jun
21
comment Deriving Taylor series for function from geometric series
@J.M. Thanks, but I still don't seem to get how this can be fitted into the Geometric Series, can you elaborate a little please?
Jun
21
asked Deriving Taylor series for function from geometric series
Jun
21
asked How to Integrate along a path
Jun
21
comment Check my solution - Modelling of a spring with Differential Equation
@anon thank you for your help, and i'll definitely keep those tips in mind next time i ask a question.
Jun
21
revised Check my solution - Modelling of a spring with Differential Equation
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Jun
20
revised Check my solution - Modelling of a spring with Differential Equation
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Jun
20
accepted Plotting a one-sided amplitude spectrum
Jun
20
asked Check my solution - Modelling of a spring with Differential Equation
Jun
20
revised Plotting a one-sided amplitude spectrum
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Jun
20
asked Plotting a one-sided amplitude spectrum