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# linear algebra

## Massvolume vs. Spacetime

Wed, 2014-01-22 14:48 - Zhigang Suo
**Apples and oranges**. Each element in a set is a pile containing some number of apples and some number of oranges. Adding two piles means putting them together, resulting in a pile in the set. Multiplying a pile and a real number *r* means finding in the set a pile *r* times the amount. We model each pile as a vector, and the set as a two-dimensional vector space over the field of real numbers.

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## Scalar done wrong

Tue, 2013-12-31 02:17 - Zhigang Suo**Update on 9 April 2016**. At the bottom of this post, I attach a pdf file of my notes on scalar.

Notes on scalars now forms part of my notes on linear algebra.

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## Textbook on linear algebra

Fri, 2013-12-27 18:39 - Zhigang SuoLinear algebra is significant to many aspects of mechanics. For some years I have been using the book by Shilov. But this book may or may not be a good one to recommend to a student, depending on his or her prior experience. On StackExchange Mathematics, there are several excellent threads discussing textbooks of linear algebra. A particular recommendation was made for

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## How do find Inverse to Rectangular Matrix?

Sat, 2009-11-14 00:50 - Muthukumar M- Read more about How do find Inverse to Rectangular Matrix?
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