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 Mar 7 comment Detectability of a particular system implies detectability of a subsystem. (Eigenvalue problem) ah thats a nice clear approach. Thanks for the answer! Mar 7 accepted Detectability of a particular system implies detectability of a subsystem. (Eigenvalue problem) Mar 5 revised Detectability of a particular system implies detectability of a subsystem. (Eigenvalue problem) edited body Mar 5 asked Detectability of a particular system implies detectability of a subsystem. (Eigenvalue problem) Feb 2 asked $A: \mathbb R^3 \to \mathbb R^3$ what is the representation of $A$ under coordinate change? (Tensor) Jan 21 awarded Yearling Dec 19 awarded Notable Question Dec 12 accepted Is the eigenspace of a matrix $A$ equal to its column space? Nov 29 accepted Supposedly easy question, at what speed does the plank hit the floor? Nov 29 comment Supposedly easy question, at what speed does the plank hit the floor? Thanks for the answer. I edited the minus sign, it was indeed a mistake. This is a question from a high school student I am tutoring and I could not believe this was actually the right answer. Nov 29 revised Supposedly easy question, at what speed does the plank hit the floor? edited body Nov 29 asked Supposedly easy question, at what speed does the plank hit the floor? Nov 9 accepted Effect of the Tikhonov regularization on the Least Squares solution. Nov 9 comment Effect of the Tikhonov regularization on the Least Squares solution. Thanks for the nice answer! Nov 9 asked Effect of the Tikhonov regularization on the Least Squares solution. Jun 24 comment Is the eigenspace of a matrix $A$ equal to its column space? Thanks for the answer! Jun 24 reviewed Approve Is the eigenspace of a matrix $A$ equal to its column space? Jun 24 asked Is the eigenspace of a matrix $A$ equal to its column space? Jun 24 awarded Popular Question Jun 15 comment Finding the last nonzero digit of the factorial of a large number Exactly but when we get above ten we cannot simply omit 12 and 15 for instance as they multiply to 180 which does change the last non zero digit, besides adding an extra zero digit.