Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
please solve this ...
suppose A and B are n by n matrices,and AB=I.prove from rank(AB)<=rank(A) that the rank of A is n . So A is invertible and B must be its twosided inverse. Therefore BA=I(Which is not obvious!).
 one year ago
 one year ago
please solve this ... suppose A and B are n by n matrices,and AB=I.prove from rank(AB)<=rank(A) that the rank of A is n . So A is invertible and B must be its twosided inverse. Therefore BA=I(Which is not obvious!).
 one year ago
 one year ago

This Question is Closed

mathsloverBest ResponseYou've already chosen the best response.1
So what we have to do .. ?
 one year ago

mathsloverBest ResponseYou've already chosen the best response.1
as given that A is n by n, rank(A) \(\le\) n and conversely : n = rank(\(I_n\))=rank(AB)\(\le\)rank(A)
 one year ago

mathsloverBest ResponseYou've already chosen the best response.1
got my point @mkumar441 ?
 one year ago

mkumar441Best ResponseYou've already chosen the best response.0
yes i got it thank you for ur quick response
 one year ago

mathsloverBest ResponseYou've already chosen the best response.1
Your welcome dear.. also: \[\huge{\mathbb{WE}\textbf{LC}\mathcal{OME}\space\textit{TO OPENSTUDY}}\]
 one year ago

mkumar441Best ResponseYou've already chosen the best response.0
i need small favour at wat timings do u present inorder post questions.
 one year ago

mathsloverBest ResponseYou've already chosen the best response.1
i didn't get you .. it seems that you are Indian. You can ask in Hindi?
 one year ago

mkumar441Best ResponseYou've already chosen the best response.0
yes i am indian but i dont Hindi.When do you be in online inorder to clarifiy my doubts?
 one year ago

mathsloverBest ResponseYou've already chosen the best response.1
ok i got you now: actually i am present here from 3:00 PM to 9:00 PM (Indian Standard Time_ or there may be breaks but yes: There are gr8 experts present you don't need to care for your clarification of doubts. In case, if your doubt is not answered then you can post the link of your question in the chat. or tag some people having good smart score....
 one year ago

mathsloverBest ResponseYou've already chosen the best response.1
lemme introduce you to some experts for your future help: experimentx mukushla Vaidehi09 amistre64 vishweshshrimali5 unklerhaukus and many more
 one year ago

mathsloverBest ResponseYou've already chosen the best response.1
just put @ sign before there names and they will be looking on your question as soon as possible.
 one year ago

mkumar441Best ResponseYou've already chosen the best response.0
Another question ..Suppose A is an m by n matrix of rank r.Its reduced echelon form is R. Describe exactly reduced row echelon form of R transpose (not A transpose).
 one year ago

mathsloverBest ResponseYou've already chosen the best response.1
Post that as a new question and tag me there.. I will help you there
 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.