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Jan 01, 2006 22:13


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Nosey git here: not spam mdu_ntr February 16 2008, 09:14:57 UTC
Hi, I'm just being nosey and browsing other people's LJs. I was just wonderring: Why Rho Theta Phi? Rthph or Rthf. What does it mean?

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Re: Nosey git here: not spam writingrat February 16 2008, 16:16:37 UTC
Heh. Well, it has absolutely nothing to do with fraternities or sororities, if that's your first thought. Or at the least, that was never my intention.

Rho theta phi refers to math. It's a 3-D coordinate system that I learned in multivariable calculus. Rho is the length of your point from the origin, theta is the angle from the x-axis, and phi is the angle from the x-axis. (and that is probably more information than you wanted)

Admittedly, it's not the cleverest icon in the world, but I really wanted another calc-related icon and it was quick and easy to make.

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Re: Nosey git here: not spam mdu_ntr February 17 2008, 03:17:46 UTC
LOL, I may not be good at math but as soon as you said it was mathematical, I knew what you meant. Thanks for the explanation.

Sororities? No, I would never have thought that. We don't have sororities here.

Why not find a calculation you really enjoy working with and use that? Hmm, it might make a complicated icon though.

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Re: Nosey git here: not spam writingrat February 17 2008, 04:41:26 UTC
LOL, I may not be good at math but as soon as you said it was mathematical, I knew what you meant. Thanks for the explanation.

Heh. Not a problem, and hopefully I did not bore you. (I tend to talk about math more than some of my friends would like)

>> Why not find a calculation you really enjoy working with and use that? Hmm, it might make a complicated icon though. <<

I'm planning to at some point (though I do have the above icon and another calculus icon). It's just a matter of looking through my book and seeing what might be fun and not impossible to squeeze into a 100x100 pixel image while maintaining semi-readability, then actually sitting down to it (I procrastinate too much).

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Re: Nosey git here: not spam mdu_ntr February 18 2008, 03:38:53 UTC
Say, what about the famous five equation? I can't remember it exactly but I'm sure you'll know which one. e^(pi,psy)+1=0

I think I got the psy part wrong but you get the point.

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Re: Nosey git here: not spam writingrat February 19 2008, 22:26:42 UTC
Hmm. I'd actually never heard of it till you mentioned it (I looked it up when you did). Fascinating, though. I wonder how it works, with e to the power of pi and i... sort of boggles the mind.

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Re: Nosey git here: not spam mdu_ntr February 20 2008, 04:31:46 UTC
Yes, it is confusing. I suggest using a scientific calcluator and playing around a fair bit. That's how I began to understand it.

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Re: Nosey git here: not spam writingrat March 15 2008, 16:14:03 UTC
Bwah, I'm sorry, I keep on meaning to reply but have always forgotten.

I shall definitely have to do that. And if all else fails, I could ask one of my math professors.

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Re: Nosey git here: not spam mdu_ntr February 18 2008, 03:42:05 UTC
Oh, I just realised you changed it *blushes*. what is that calculation used for? I don't know what the "lim" or "->" (arrow) mean.

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Re: Nosey git here: not spam writingrat February 19 2008, 22:25:18 UTC
Pssh. No worries. I miss details all the time, particularly at work (which is bad. Shame on me).

It's the equation for a Reimann's sum. I learned it during my first semester of calculus and it performs a similar function to a definite integral (that is, the area under a curve). And the lim and arrow indicate that the value you’re looking for is the limit of the equation as the x-value approaches infinity.

Or in plain English (or, plainer?) it indicates that you’re looking for the x-value that the equation approaches as the x-value goes toward infinity. Limits is something you’d learn in calculus or precalculus. (does your country pace teach math in the same order as the US? I’ve no clue in what order other countries teach math)

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Re: Nosey git here: not spam mdu_ntr February 20 2008, 04:38:27 UTC
I slightly remember doing what you are talking about, I understand now.

Are you referring to uni or high school mathematics? I've never done a subject called "calculus". In QLD there is Trade and Business Maths, Maths A, B and C. I did Maths B, the second from the top. In NSW they have a similar system but they call them Trade and Business Maths, General Maths, Advanced Maths, Extention Maths 1 and 2. i can;t exactly remember most of what I did, I'm not that good at maths. they sort of do different types of maths all in the one subject.

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Re: Nosey git here: not spam writingrat March 15 2008, 16:30:59 UTC
Yikes. It sounds like the way you're taught math may be entirely different from the way the US systems do. We cover them by individual subject areas. In high school--or starting in middle school, depending on the person and school--schools offer the following subjects ( ... )

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Re: Nosey git here: not spam mdu_ntr March 16 2008, 01:26:51 UTC
Trade and business Maths is for people who are VERY bad at maths so need to be taught the basics they will need when they leave school. The other maths go by how hard the they are.

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