Links-Multiplikation

English translation: left multiplication, pre-multiplication

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GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
German term or phrase:Links-Multiplikation
English translation:left multiplication, pre-multiplication
Entered by: jccantrell
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15:12 Feb 2, 2018
German to English translations [PRO]
Tech/Engineering - Mathematics & Statistics
German term or phrase: Links-Multiplikation
Hi folks.
I am at the limit of my math understanding and need some help with this term. Here is the usage:

Y = XG + N . (13.1)
Links-Multiplikation dieser Gleichung mit dem komplex konjugierten Eingangsspektrum X liefert
XY = XXG + XN . (13.2)

(In the second equation, the first X in each term has a bar over it as does the X following 'Eingangsspektrum.')

Now, I see what they are doing. As matrix multiplication is not commutative, it seems they are telling me to put the X-bar on the LEFT side of each term. OK, but WHAT do we call that in English? I am tempted to use:
Multiplying this equation by the complex conjugate input spectrum X yields ...

and just finesse the whole problem.

The client suggested 'outer product' but that is a bit beyond my math knowledge so I really cannot assess its validity.

Are there any math wizards out there who can help me with references or who have a translation for this?

Thanks.
jccantrell
United States
Local time: 20:33
left multiplication, pre-multiplication
Explanation:
The literal translation is correct, it's left-multiplication or pre-multiplication. Not sure about correct hyphenization.
Selected response from:

Erik Freitag
Germany
Local time: 05:33
Grading comment
Thanks to Erik and everybody else who commented. I just never thought of looking for the obvious answers.
A reference would have been nice, but, as Erik said, that is not his job.
2 KudoZ points were awarded for this answer



Summary of answers provided
4 +4left multiplication, pre-multiplication
Erik Freitag
Summary of reference entries provided
reference
Mair A-W (PhD)

Discussion entries: 12





  

Answers


12 mins   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): +4
left multiplication, pre-multiplication


Explanation:
The literal translation is correct, it's left-multiplication or pre-multiplication. Not sure about correct hyphenization.


Erik Freitag
Germany
Local time: 05:33
Specializes in field
Native speaker of: Native in GermanGerman
PRO pts in category: 44
Grading comment
Thanks to Erik and everybody else who commented. I just never thought of looking for the obvious answers.
A reference would have been nice, but, as Erik said, that is not his job.

Peer comments on this answer (and responses from the answerer)
agree  philgoddard: Though I think you need a reference.//Yes, it is, because it makes your answer more authoritative, rather than saying "trust me, I know." And I think it's non pro because it's easy to guess even if you don't know it.
10 mins
  -> Thanks! I don't think looking for references is my job (unless my answer is obscure or being challenged). BTW: I really don't think this is a non-pro question.

agree  Mair A-W (PhD)
11 mins
  -> Thanks!

agree  Sabine Akabayov, PhD
4 hrs

agree  Björn Vrooman: Maybe that helps: https://math.nyu.edu/~neylon/linalgfall04/project1/dj/propof... Don't ask me, but I get better results looking for the verb "left mutiply" + matrix than for the noun. Google is a mysterious creature.
5 hrs
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Reference comments


1 hr peer agreement (net): +1
Reference: reference

Reference information:
https://en.wikipedia.org/wiki/Matrix_multiplication#Properti...
https://de.wikipedia.org/wiki/Matrizenmultiplikation#Definit...

Mair A-W (PhD)
Germany
Specializes in field
Native speaker of: Native in EnglishEnglish
PRO pts in category: 4

Peer comments on this reference comment (and responses from the reference poster)
agree  Björn Vrooman
4 hrs
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