Search found 25 matches

by Samej
Sun Apr 18, 2010 2:57 pm UTC
Forum: Science
Topic: Quantum mechanics: a question about symmetric potentials.
Replies: 5
Views: 2019

Re: Quantum mechanics: a question about symmetric potentials

Black Sails: write as a sum of energy eigenstates?
by Samej
Sun Apr 18, 2010 1:47 pm UTC
Forum: Science
Topic: Quantum mechanics: a question about symmetric potentials.
Replies: 5
Views: 2019

Quantum mechanics: a question about symmetric potentials.

In a 1d symmetric potential, the ground state always has even parity (and the nth exited bound state, parity (-1)^n). Why is this? (Every book I've found seems to just assume that the ground state is never zero/ has only one extremum without any justification. I know I'm probably just missing someth...
by Samej
Thu Sep 04, 2008 3:22 pm UTC
Forum: Serious Business
Topic: The British government (and the West Lothian question)
Replies: 16
Views: 2104

The British government (and the West Lothian question)

For the sake of those who don't know: The UK can be split up into four regions: England, Northern Ireland, Scotland and Wales (each of which, with the possible exception of northern Ireland (depending on your definitions), was at some time in history an independent state). All of these regions are d...
by Samej
Thu Sep 04, 2008 2:22 pm UTC
Forum: General
Topic: Who the dickens are you?
Replies: 10922
Views: 2412564

Re: INTRO THREAD THE THIRD

Hi! you can probably guess my real name from the screen name I'm using (No, it's not a typo (or rather it was, but on something else and I've carried it forward)). I actually joined quite a while ago (over a year ago in fact) but haven't been active in ages.
by Samej
Fri Oct 05, 2007 9:51 pm UTC
Forum: Mathematics
Topic: A request
Replies: 2
Views: 961

A request

I am a first year physics student and as such am being taught fair bit of applied maths; however I am worried about getting too far behind in my pure maths: I was wondering if anyone could recommend any books I could study in my spare time (ideally going up to a first/second year of maths degree sor...
by Samej
Fri Sep 21, 2007 11:30 am UTC
Forum: News & Articles
Topic: Andromeda Strain
Replies: 14
Views: 2699

From the article:
There is also "a lot of panic and fear because villagers are afraid that other space objects could fall," Quispe told AFP.


Why are they any more worried than before?
by Samej
Mon Sep 17, 2007 8:45 pm UTC
Forum: General
Topic: Why I'll never use a teleportation device.
Replies: 79
Views: 6044

Please correct me if I'm wrong here but isn't a machine that dosen't destroy the original (or at least serously damage it) when it makes the stuff (techinical term) that gets transmitted impossible under quantum mechanics (although telelportation itself isn't)? On the moral issue:if the copy that's ...
by Samej
Mon Sep 17, 2007 6:57 pm UTC
Forum: Serious Business
Topic: Transhumanism
Replies: 461
Views: 46305

Someone a couple of posts back mentioned a "natural order"; things like this always confuse (or slightly annoy) me, what does that term actually mean? Also, some clarification of the term "natural" may be necessary, I have often seen it used to imply that there are (real) things ...
by Samej
Wed Sep 12, 2007 8:18 pm UTC
Forum: News & Articles
Topic: The future: roasting chestnuts on an open puddle?
Replies: 31
Views: 4632

If you want a laugh look at the ratings on the youtube comments, all the sensible ones have beeen marked down.
by Samej
Tue Sep 04, 2007 5:14 pm UTC
Forum: School
Topic: What degree have/are/will you studied/studying/study.
Replies: 273
Views: 30796

By the end of this month I'll be studying "natural sciences" (which, for me, is basically physics (it's what they term all the main science courses)) at the University of Cambridge; it's safe to say I'm a little nervous.
by Samej
Sun Aug 12, 2007 6:16 pm UTC
Forum: Forum Games
Topic: xkcd's: 10,000 reasons why mankind is doomed
Replies: 285
Views: 35314

#11. Thermodynamics
by Samej
Wed Jun 27, 2007 10:05 am UTC
Forum: Forum Games
Topic: Cheddar Gorge?
Replies: 1294
Views: 150754

rapidly
by Samej
Tue Jun 12, 2007 3:50 pm UTC
Forum: Serious Business
Topic: Fun article on ethics by an MIT professor, but --
Replies: 18
Views: 4087

Sorry, you might have misunderstood, my argument wasn't that entities share morality, it was that they don't (for example see debates over euthanasia, abortion, genetic engineering, ect.); if there were an absolute objective morality then surely such disagreements would be absent (or at least rare)....
by Samej
Sun Jun 10, 2007 4:51 pm UTC
Forum: Serious Business
Topic: Fun article on ethics by an MIT professor, but --
Replies: 18
Views: 4087

Jjwells is right; my post was just an excuse to moan about the sort of philosophers that concentrate more on words than the actual ideas. (that's phrased better).

Jwwells; might I ask why you take stance A? It seems to me that C would be the logical conclusion, given that the “moralsâ€
by Samej
Sat Jun 09, 2007 4:16 pm UTC
Forum: Science
Topic: A real water world (merged with "a big ball of water")
Replies: 154
Views: 39644

It occurs to me that a sphere might not be the only stable shape; giant water torus anyone? (it would have to be rotating to stop it collapsing inwards, but I think it could work)
by Samej
Fri Jun 08, 2007 7:52 pm UTC
Forum: Serious Business
Topic: Fun article on ethics by an MIT professor, but --
Replies: 18
Views: 4087

Yakk is right; in my experience of philosophers (which I am fully prepared to admit is rather limited) they tend to put more emphasis on how something is phrased than the actual information conveyed, even re-defining words to support their points or trying to persuade you that the derivation of a wo...
by Samej
Sat Jun 02, 2007 6:26 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0271: "Powers of One"
Replies: 114
Views: 42866

The problem I always had with powers of 1 is thus: A line (1st power) is bounded by two points (0th power) A square (2nd power) is bounded by four lines A cube (3rd power) is bounded by six squares or 12 lines A hypercube (4th power) is bounded by... uh... Also, I have trouble dealing with the idea...
by Samej
Sat May 19, 2007 10:30 pm UTC
Forum: Science
Topic: Non-existing physical constructs
Replies: 198
Views: 31933

Ignoring relativity (for obvious reasons (i.e space)); light, inextensible string (for whipping at light speed (or infinate speed if combined with previous) and whatever means they use to give an object an instant change in momentum at the start of mechanics problems.
by Samej
Wed Apr 11, 2007 7:49 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0247: "Factoring the Time"
Replies: 137
Views: 54091

And, to cheers of nerdy joy across the world, I can annonce that 31337 is prime!
by Samej
Sat Mar 17, 2007 6:01 pm UTC
Forum: Science
Topic: Colonizing other planets
Replies: 64
Views: 4875

Just wanted to say that I agree wholheatedly agree with most of what has been said in this thread, anyone who objects to space colonisation hasen't thought it through (I mean, there's the future of intelligent life and all but also it's SPACE, where films set in space are set...). It also says alot ...
by Samej
Mon Mar 05, 2007 6:35 pm UTC
Forum: General
Topic: odd things about yourself
Replies: 357
Views: 62867

I'm glad to hear I'm not the only one who thinks about gravity inversions (or rotations). Also, the first bone in both my big toes is fused to the second and I tend to walk on my toes when not wearing shoes.
by Samej
Wed Feb 07, 2007 9:36 pm UTC
Forum: Forum Games
Topic: Picture Pwn4ge!
Replies: 8368
Views: 1225815

better near-to-mid-future-decived/controlled-ignorant-populus film
Image
by Samej
Wed Feb 07, 2007 7:44 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0019: "George Clinton"
Replies: 16
Views: 10452

However; Brian May (the guitarist from Queen) is an astrophysicist currnetly studing for a phD. FACT.
by Samej
Mon Feb 05, 2007 8:58 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0218: "Nintendo Surgeon"
Replies: 98
Views: 36049

ohki wrote: the countdown sound from running out of air in sonic the hedgehog still makes me panic and look around feverishly for bubbles.


I'm so glad to hear I'm not the only one.
by Samej
Fri Jan 12, 2007 5:05 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0209: "Kayak"
Replies: 53
Views: 23644

About the alt text: if the universe ends in under t years than there is no future a distance ct away. (to us here anyway)

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