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    Inner product

    Thanks. Although using my definition for the standard inner product I had to use \langle a , b \rangle = a^t \bar{y}, but it all worked out in the end.
  2. D

    Inner product

    Is there a non-ugly proof of the following identity: \langle Ax,y \rangle = \langle x,A^*y \rangle where A is an nxn matrix over, say, \mathbb{C}, A* is its conjugate transpose, and \langle \cdot , \cdot \rangle is the standard inner product on \mathbb{C} ^n.
  3. D

    Computer Science = helpful?

    Yeah, I agree, Java is an OK intro to programming language, but it's not an excellent language in general.
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    I want to study real physics where to start?

    Umm, you mean Real and Complex Analysis by Rudin? For a highschool student aspiring to learn physics? Are you mad?
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    Courses How do you deal with courses you just hate?

    Because they are boring as hell. :wink:
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    Oh the joys of grading

    In one of the papers I marked, the student listed all the primes to brute force a question. Good thing there are only like 15 primes. :wink:
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    How many integers from 1 through 99,999 is the sum of their digits = 9?

    Aren't they simply those integers divisible by 9? So there should be 99,999/9 of them.
  8. D

    Forums groups not collapsing/expanding in Prime

    They did. You could switch to the other skin, collapse them, and switch back.
  9. D

    What will they think of next?

    I think it was pretty cool. :approve:
  10. D

    Forums groups not collapsing/expanding in Prime

    The title says it all. Just wanted to point it out.
  11. D

    I hurt my back

    Ah, thanks. :biggrin: :blushing:
  12. D

    I hurt my back

    Good luck! :smile: Haha - I know what you mean!
  13. D

    I hurt my back

    Oops, I thought the term chiropractor meant "bone doctor." I guess I was wrong; should I have used orthopedician instead?
  14. D

    Roommate that gets allowance

    I'm 19 and I get allowance. (I have a part-time job during school, and ideally a full-time job otherwise.) Where I'm from, it's perfectly natural for your parents to take care of you financially until you get your degree. Then it's your turn to work your ass off so they can retire with luxury...
  15. D

    What is it really like to be a mathematician?

    Thanks for that!
  16. D

    Best book thread again

    Axler vs Friedberg isn't a straightforward comparison. On the one hand, Friedberg covers a LOT of material, with much more exercises per topic. On the other hand, Axler's proofs are pretty nice. I like both books.
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    I hurt my back

    Go to a chiropractor as soon as you can. Also, NEVER over-estimate what you can deadlift. And if you find that your first rep was really difficult, lower the weight. Deadlifting is one of the exercises you do not want to perform with bad form. It's better to have a bruised ego than a messed up...
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    Lets guess the movie

    heman's last one is She's the Man.
  19. D

    Lets guess the movie

    I want to say Scarface.
  20. D

    Lets guess the movie

    The last one looks like City of God.
  21. D

    Lets guess the movie

    Yeah, it definitely is Shawshank. Brilliant movie.
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    Open Book fiasco

    That sucks man. It reminds me of that time I walked into a differential equations exam only to find that I had a pen - no pencil, calculator, nothing - just a pen! Needless to say, the.. aesthetics of my paper weren't what you would call pleasing. Plus I ran out of time and couldn't finish the...
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    Studying Learning Sources: Internet or Books?

    I think I go by the old saying: "a person who doesn't read books has no advantage over the one who can't." Although I don't think it's particularly applicable here; it's still a good saying! My point is: books are superior to the internet in this regard. I'll use the internet to gather history...
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    Am I supposed to be this lost?

    Having good social skills does not make you a good teacher.
  25. D

    Is anyone an actuary?

    I too have heard that the exams are extremely difficult. You might want to check this site out: http://www.beanactuary.org/
  26. D

    Hi every one

    Na'am. :wink: (Ayojad lahja mo'ayyana tatakallam/tatakallamin biha? 3alashan 7as 7ali 7mar lamma a7ki bel fus7a!) Fa mal-so'al? Sorry I can't type in Arabic though.
  27. D

    Hi every one

    I speak Arabic, so if you want I can act as a translator.
  28. D

    Best Show Ever

    I'll jump on the "I Don't See Why People Think Scrubs is Funny" bandwagon. That said, the best show ever is obviously House.
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