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# 8 Comments

 Sep18 comment Matrix riddle I came across Yeah, so I am not able to solve it for a 2x2 case either because I don't know what T or lambda are. The only thing I know is that Jlambda and JA are related by a similarity transform, the transformation matrix being T. But equating their eigenvalues gives me just one 5 equations... So, I'm not sure how to proceed. Sep17 comment Matrix riddle I came across @Gerry Myerson: I'm sorry, but I actually didn't know that you could accept answers until you and someone else pointed it out to me. Sep17 comment Matrix riddle I came across They are all zeros. Aug21 comment Galilean transformations @Mark Bennet: By uniform motion, I mean something of the form g(t,x) = (t,x+v*t), where v is a three-component velocity and x is a vector in R3. Jul5 comment Block Diagonalizing an antisymmetric matrix yeah, it's an antisymmetric matrix and it will probably have compex eigenvalues. so, my question is how to put it in block diagonal form. Thanks! Jul1 comment Open sets, topology @Qiaochu Yuan: Okay! I understand the analogy you give in the link! Thank you! Jun30 comment Open sets, topology So, more generally, is it just that when you take the intersection of an infinite number of sets, there's a possibility of getting a closed set. So, we just exclude such intersections? Jun30 comment Open sets, topology I'm sorry, I'm not sure if the answer in the link you provided and the question GEdgar is asking make complete sense to me. So, is the point that an intersection of an infinite number of open sets might not be open because it could turn out to be a single point (which would be closed), or is it that it's too difficult to determine if the intersection of an infinite number of open sets is open (which is what the first answer in the link you gave says.)