Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
Why does it matter what c is equal in problem #3a to if it disappears thanks to elimination? (Sorry if that's a dumb question.):
http://ocw.mit.edu/courses/mathematics/1806sclinearalgebrafall2011/axbandthefoursubspaces/exam1/MIT18_06SCF11_ex1s.pdf
Any input would be greatly appreciated!
 one year ago
 one year ago
Why does it matter what c is equal in problem #3a to if it disappears thanks to elimination? (Sorry if that's a dumb question.): http://ocw.mit.edu/courses/mathematics/1806sclinearalgebrafall2011/axbandthefoursubspaces/exam1/MIT18_06SCF11_ex1s.pdf Any input would be greatly appreciated!
 one year ago
 one year ago

This Question is Closed

ingenuusBest ResponseYou've already chosen the best response.1
if c=3, you cannot divide a number by (c3)
 one year ago

ingenuusBest ResponseYou've already chosen the best response.1
it is zero.. so they have seperated two cases, one when c=3 and the other when c !=3
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Oh. I see; it's all about the pivot being nonzero.
 one year ago

ingenuusBest ResponseYou've already chosen the best response.1
no no no it matters because you can't divide a number by 0
 one year ago

ingenuusBest ResponseYou've already chosen the best response.1
if c=3 a thing such as 4/(c3) doesn't exist!!
 one year ago

ingenuusBest ResponseYou've already chosen the best response.1
so you can't make the arguments as those cases for c !=3
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Ya, that too BUT if we do not divide by (c3) = 0, there is nothing illegal and we get what would be a pivot to be a 0.
 one year ago

ingenuusBest ResponseYou've already chosen the best response.1
what i am saying is the only reason for seperating the cases
 one year ago

ingenuusBest ResponseYou've already chosen the best response.1
pivot to be 0 doesn't make any sense because the first appearing 1s are called pivots
 one year ago

ingenuusBest ResponseYou've already chosen the best response.1
you can do your elimination process because c!=3(the one you did previously) you can't argue something like 'Why does it matter what c is equal in problem #3a to if it disappears thanks to elimination' since it's not the case! for c=3 you need to make a whole new different arguments
 one year ago

ingenuusBest ResponseYou've already chosen the best response.1
i mean look at the basis for C(A) they are different!! it matters!!
 one year ago

ingenuusBest ResponseYou've already chosen the best response.1
two different case, two different logics, two different consequences
 one year ago

s3aBest ResponseYou've already chosen the best response.0
if c = 3, then it's a simple plugging in of c = 3, and then you have 3  3 = 0 and then you have a matrix with only regular numbers. I think we're miscommunicating again, lol.
 one year ago

s3aBest ResponseYou've already chosen the best response.0
I know that the bases are different. That's because the pivot from c!=3 is no longer a pivot; it's now a 0.
 one year ago

ingenuusBest ResponseYou've already chosen the best response.1
what you just said is right well what is it then that you don't understand?
 one year ago

s3aBest ResponseYou've already chosen the best response.0
I now do understand this problem. :)
 one year ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.