# Gigili

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I write to discover what I think.

 Jun23 comment How do I simplify this derivative? It's a bit weird that the one who answered first got nothing, and I don't think a straight forward question like this needs three answers that none of them add anything new. Jun21 comment Consistency of the system $AX=b$ Yes, thank you very much. Jun21 comment Evaluating $\int_A y^2 dA$ I think I get it now, but I have to double check the equation O had in the course book and make sure I can do it the same way. (congratulation for being a 1k user and thank you for your answer =) Jun21 comment Evaluating $\int_A y^2 dA$ @Fantini: Currently I am studying MS in Comutper Science and we didn't have to take such a course or at least I don't recall having taken it. Jun21 comment Evaluating $\int_A y^2 dA$ @mike: I still don't get it, I don't know how to evaluate such integrals. An example would be nice. Jun21 comment Evaluating $\int_A y^2 dA$ @Batman: Thanks, then do we integrate with respect to $x$ or $y$? And what's the role of $A$ beneath the integral sign? Jun21 comment Evaluating $\int_A y^2 dA$ @Batman: This is a problem in the book titled "mechanics of materials", I think no one on this site is interested in the concept. Just want to know more about the integral itself. Jun21 comment Consistency of the system $AX=b$ Could you state the reasons as to why when $\text{null} (A)$ it has one unique answer and infinitely many otherwise? Jun20 comment Consistency of the system $AX=b$ Thank you for your answer. I edited the question to clarify what I mean by $\mathbb R(A)$. Jun20 comment Consistency of the system $AX=b$ @Omnomnomnom: Yes, I edited my question to clarify. Thank you. Jun16 comment Why is smallest singular value of a singular matrix zero? You're right @StephenMontgomery-Smith, I translated the statement into English and made that mistake. It was "singular" matrix. Jun16 comment Why is smallest singular value of a singular matrix zero? @Tom: I made a mistake, sorry. May20 comment Why is a set of orthonormal vectors linearly independent? @GitGud: I edited the question accordingly, could you tell me why it is not needed? Feb4 comment Lagrange Multipliers have no solution It's difficult to make sense of your problem as it stands, please provide more context. Jan26 comment How to show $((k+1)!)^2 2^k \leq (2(k+1))!$ @StevenStadnicki: Right, but your comment is a thorough answer as it stands. You could post it as an answer and ... Ta-Da! The problem is solved! Jan26 comment How to show $((k+1)!)^2 2^k \leq (2(k+1))!$ @StevenStadnicki: Why would you post a complete answer as a comment which left us with nothing? Jan26 comment How to prove this theorem from precalculs Please improve the question by providing additional context, which ideally includes your thoughts on the problem and any attempts you have made to solve it. This information helps others identify where you have difficulties and helps them write answers appropriate to your experience level. Jan15 comment Rank of matrix as a difference of ranks I'm sorry, but what should I thank you for? Jan14 comment Factorial of $(7/2)!$ Oops, I ruined your joke by editing the title, sorry @AsalBeagDubh! Jan14 comment Factorial of $(7/2)!$ For half-integer values, there's this Wikipedia article which explains it.