Oh Hey There

Rule of Sarrus: To calculate the determinant of a 3x3 matrix, add the products along the solid diagonals and subtract the products along the dashed diagonals.

I have an exam in linear algebra today, and this rule is very handy. But it is mentioned nowhere in my textbook, which I now resent greatly. If you ask me, the only thing the text has on Wikipedia are the exercises and the paper to write on. Then again it’s also heavy and not free.

Notes:

1. creativelybored liked this
2. davidcustiskimball reblogged this from fuckyeahmath and added:

   Mathematics, Law In defense of Wikipedia, they are dynamic… and can self-correct. Textbooks have to be politically...

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7. degree liked this
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9. whisperoftheshot reblogged this from fuckyeahmath and added:

   I have never liked this method. It has always seemed childish in my mind. I prefer the columns method (I dont know the...

10. edumelo liked this
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13. arathon reblogged this from fuckyeahmath and added:

    akin kifogna a lineáris algebra, az még tumblr-en is okulhat :)

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16. lefan reblogged this from tristn and added:

    simplification of...long-form proof. so, if you are working with variable only, sure

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