| 
  • If you are citizen of an European Union member nation, you may not use this service unless you are at least 16 years old.

  • You already know Dokkio is an AI-powered assistant to organize & manage your digital files & messages. Very soon, Dokkio will support Outlook as well as One Drive. Check it out today!

View
 

Quiz talk: Linear systems

Page history last edited by RH 15 years, 3 months ago

Here you can discuss the quiz. 

Comments (2)

M L said

at 5:47 am on Oct 1, 2012

Q9 asks what can happen with a homogeneous system in two equations and three unknowns. The given correct answer is that "One usually has infinitely many solutions, but occasionally one just has only the zero solution." -- but this is wrong. The correct answer is "One has infinitely many solutions, including the zero solution." (A 2x3 matrix always has nullity at least 1, so the kernel is never trivial; or, put otherwise, the intersection of two planes through the origin is always at least one-dimensional -- one never has "only the zero solution.")

Terence Tao said

at 6:12 am on Oct 1, 2012

Oops, you're right; it should be fixed now.

You don't have permission to comment on this page.