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 Oct7 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. Oct6 comment $4 \times 4$ matrix and its inverse. Is my method ok? I know, but i would love to proove it using adjugate formula. Oct5 asked $4 \times 4$ matrix and its inverse. Is my method ok? Jun18 awarded Self-Learner Jun17 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. Jun17 awarded Supporter Jun17 awarded Teacher Jun17 answered How to divide by $(a_1,a_2,a_3)$ Jun17 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 Jun17 awarded Student Jun17 asked How to divide by $(a_1,a_2,a_3)$ Apr10 comment How to derive a differential equation of an ellipse Thank you, this is a good explanation. Apr10 awarded Scholar Apr10 accepted How to derive a differential equation of an ellipse Apr5 asked How to derive a differential equation of an ellipse Dec20 awarded Autobiographer