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12-16-2010, 02:30 PM #301
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12-16-2010, 02:48 PM #302
Hey I do research involving optics so I'm always having to sit down for 5 hour sessions figuring out the geometry of some new lens design or something like this, then sometimes it's involving harmonics, etc, maths is awesome and I think anyone who disagrees must have had a bad teacher some time in their childhood.
just sayin hi
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12-16-2010, 03:18 PM #303
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12-16-2010, 03:23 PM #304
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12-16-2010, 03:29 PM #305
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12-16-2010, 05:01 PM #306
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12-16-2010, 05:20 PM #307
No.
The right hand side will be positive for ALL x values.
But, I can see what you're getting at.
Let's say that the right hand side would be positive for all x values above 1/2 ok. This is NOT the case here but let's pretend it is.
Now we know that x must be greater than 1/2
BUT
The left hand side tells us x must be greater than sqrt(2).
So...
What would happen if x is greater than 1/2 but less than sqrt(2)?
The right hand side would be positive and the left hand side negative.
So we need to have x greater than sqrt(2)!
You may be misunderstanding the absolute value symbol.
|x| = x is x is positive, -x if x is negative.
Hence, |x| can never be negative.
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12-16-2010, 05:41 PM #308
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12-17-2010, 09:40 AM #309
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12-17-2010, 12:37 PM #310
Guys, what can I do with my BSc in Applied Math? My grades will not be good enough to get into grad school. Other than Actuarial work, i'm lost. Halp?
Actually, meh. I still have 4 full semesters left in order to graduate, and my GPA is a 2.00. Could significantly improve.Last edited by MUFC; 12-17-2010 at 01:01 PM.
"If you can read this and still disagree, fantastic; just realize that you’re wrong." - Lyle McDonald
"We serial killers are your sons, we are your husbands, we are everywhere. and there will be more of your children dead tomorrow."
Disclaimer: Half of the stuff I say is said to piss you off. Everything else is just a lead up to me trolling you.
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12-17-2010, 01:21 PM #311
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12-17-2010, 05:22 PM #312
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12-17-2010, 06:54 PM #313"If you can read this and still disagree, fantastic; just realize that you’re wrong." - Lyle McDonald
"We serial killers are your sons, we are your husbands, we are everywhere. and there will be more of your children dead tomorrow."
Disclaimer: Half of the stuff I say is said to piss you off. Everything else is just a lead up to me trolling you.
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12-17-2010, 07:20 PM #314"If you can read this and still disagree, fantastic; just realize that you’re wrong." - Lyle McDonald
"We serial killers are your sons, we are your husbands, we are everywhere. and there will be more of your children dead tomorrow."
Disclaimer: Half of the stuff I say is said to piss you off. Everything else is just a lead up to me trolling you.
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01-05-2011, 03:18 PM #315
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01-06-2011, 02:03 AM #316
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01-23-2011, 05:18 PM #317
So maths chaps what courses you taking this year and how's it all goin?
Currently doing my masters and this semester is...
Fluid dynamics
Scientific computing
Computational stats
Extrasolarplanets and astrophysical discs.
Sounds like in doing physics lol but I don't really enjoy pure math so stick with all the applied stuff.
Final project will be on finding analytical solutions to orbits near Lagrange points.
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02-10-2011, 04:27 PM #318
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02-10-2011, 04:43 PM #319
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02-10-2011, 06:18 PM #320
Well you know f''(0) = 0 (second derivative at inflection point) and f'(2) = 0 (first derivative at local max/min). So:
f'(x) = 3ax^2 + 2bx + c
f''(x) = 6ax + 2b
f''(0) = 0 => b = 0
f'(2) = 0 => 12a + c = 0
Putting these in the original function:
f(x) = ax^3 - 12ax + d
Now you also know f(0) = 2 and f(2) = 6.
f(0) = d = 2
f(2) = 8a - 24a + d = 8a - 24a + 2 = -16a + 2 = 6 => a = -0.25
From above 12a+c = 0 => c = 3
So:
a = -0.25
b = 0
c = 3
d = 2
Assuming I didn't make an arithmetic mistake (which happens far too often) that'll do it.
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02-10-2011, 06:25 PM #321
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02-11-2011, 06:10 AM #322
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02-11-2011, 06:16 AM #323
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03-06-2011, 01:13 PM #324
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03-06-2011, 06:21 PM #325
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03-13-2011, 05:23 PM #326
http://web.mit.edu/abhinavk/www/inte...e/qual2011.pdf
For any integral fans out there...
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03-13-2011, 06:36 PM #327
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03-13-2011, 06:39 PM #328
Most of it, as dumb as it sounds the pre-calc/trig concepts are the things raping me since relearning all the trig properties is rather tedious. Have not taken abstract algebra or number theory so have been trying to teach it to myself but the practice tests I have taken have only had 2-3 questions from those fields so may just end up skipping them unless they are something I can solve with my weak knowledge in those fields.
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03-14-2011, 03:23 AM #329
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03-14-2011, 03:53 AM #330
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