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/sci/ - Science & Math

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Anonymous Wed Apr 11 16:22:10 2012 No.4565487 [Reply] [Original]

I don't get this expression.
Why do you invert (1,1) by (2,2) and not (1,2) with (2,1)?

>>	Anonymous Wed Apr 11 16:24:17 2012 No.4565493 just a quick answer for a quick question

>>	Anonymous Wed Apr 11 16:28:50 2012 No.4565507 File: 212 KB, 1280x1024, 78825.jpg [View same] [iqdb] [saucenao] [google] I am completely sure, I could answer your question if I knew what the fuck you were talking about.

>>	Anonymous Wed Apr 11 16:29:57 2012 No.4565513 >>4565507 I'm reffering to > invert (1,1) by (2,2) what?

>>	Anonymous Wed Apr 11 16:37:53 2012 No.4565552 >>4565507 >>4565513 sorry. matrices. Normaly A = 3 2 -6 6

>>	Anonymous Wed Apr 11 16:39:10 2012 No.4565558 I think everyone would be a lot more helpful if you phrased what you were asking in a manner that is at least slightly understandable.

>>	Anonymous Wed Apr 11 16:42:25 2012 No.4565569 Why when you do 1/det^a or a^-1 you switch 1,1 for 2,2 but you don't switch 1,2 for 2,1 and instead you just make them negative. how is it hard to understand?

>>	Anonymous Wed Apr 11 16:48:06 2012 No.4565589 >>4565569 DO YOU SPEAK ENGLISH

>>	Anonymous Wed Apr 11 16:48:06 2012 No.4565590 To figure it out, just row reduce [A I] to get [I A^-1].

>>	Anonymous Wed Apr 11 16:48:06 2012 No.4565592 >>4565589 What?

>>	Anonymous Wed Apr 11 16:49:14 2012 No.4565598 >>4565590 that doesn't help me sorry. what do you mean by row reducing?

>>	Anonymous Wed Apr 11 16:58:17 2012 No.4565638 >>4565569 Oh, I see. You mean entries (1,1), etc. It's because of the definition of the determinant. You might check this out: http://www.youtube.com/watch?v=vJLGWpob0T8

>>	Anonymous Wed Apr 11 17:20:58 2012 No.4565733 >>4565638 I'm watching right now