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 Oct 7 awarded Critic Oct 7 comment $4 \times 4$ matrix and its inverse. Is my method ok? When you get to "shared download site you need to click the LOWER download button. The upper one is just commercial. Oct 6 comment $4 \times 4$ matrix and its inverse. Is my method ok? I know, but i would love to proove it using adjugate formula. Oct 5 asked $4 \times 4$ matrix and its inverse. Is my method ok? Jun 18 awarded Self-Learner Jun 17 comment How to divide by $(a_1,a_2,a_3)$ Thank you for pointing that out. Here is the link to the Slovenian Wikipedia site where they put it down wrong. Jun 17 awarded Supporter Jun 17 awarded Teacher Jun 17 answered How to divide by $(a_1,a_2,a_3)$ Jun 17 comment How to divide by $(a_1,a_2,a_3)$ Yes it is correct $(\boldsymbol{a}_1, \boldsymbol{a}_2, \boldsymbol{a}_3)$ is only a notation for a scalar triple product. And this solves my problem. TY Jun 17 awarded Student Jun 17 asked How to divide by $(a_1,a_2,a_3)$ Apr 10 comment How to derive a differential equation of an ellipse Thank you, this is a good explanation. Apr 10 awarded Scholar Apr 10 accepted How to derive a differential equation of an ellipse Apr 5 asked How to derive a differential equation of an ellipse Dec 20 awarded Autobiographer