My Math Forum Am I missing something? Confused.

 Linear Algebra Linear Algebra Math Forum

April 26th, 2018, 12:44 PM   #1
Senior Member

Joined: Oct 2016
From: Arizona

Posts: 207
Thanks: 37

Math Focus: I'm still deciding, but my recent focus has been olympiad problems and math journal problems.
Am I missing something? Confused.

I'm completely new to groups. I am trying to follow the proof of (1) in the attached picture.

I do not understand the part in the first line of the proof of (1) where we have $(a \oplus \tilde{a})a_1$.

What I mean is, it seems strange that the $a_1$ is written right next to it. Are we assuming that multiplication is an operation as well?

That notation is not used for the whole rest of the proofs.

P.S. I don't know why the attachment is displaying sideways, I uploaded it right side up. This comes out of the book Linear Algebra by Jorg Liesen and Volker Mehrmann page 24.
Attached Images
 IMG_9504.jpg (94.9 KB, 15 views)

Last edited by ProofOfALifetime; April 26th, 2018 at 12:53 PM.

 April 26th, 2018, 01:14 PM #2 Senior Member   Joined: Oct 2009 Posts: 838 Thanks: 323 It seems like a typo. Thanks from ProofOfALifetime
 April 26th, 2018, 01:35 PM #3 Senior Member     Joined: Oct 2016 From: Arizona Posts: 207 Thanks: 37 Math Focus: I'm still deciding, but my recent focus has been olympiad problems and math journal problems. Okay, thanks. I'll just try to find a different proof online.
 April 26th, 2018, 04:03 PM #4 Senior Member     Joined: Oct 2016 From: Arizona Posts: 207 Thanks: 37 Math Focus: I'm still deciding, but my recent focus has been olympiad problems and math journal problems. Why is it so hard for them to proofread?

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