Compact Notation of RxN Mechanism

AI Thread Summary
The discussion revolves around the interpretation of coefficient matrices {{\nu'_{ji}}} and {{\nu''_{ji}}} in a combustion text. The main concern is whether these matrices function as proper matrices that can be multiplied by a vector to yield the system of equations presented in equation 4.29. There is confusion regarding the reversed indexing convention, where 'i' typically represents the row index and 'j' the column index, leading to frustration in understanding the notation. The participant questions if their confusion stems from fatigue or if there is a legitimate issue with the matrix representation and indexing.
Saladsamurai
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Hello all!

I am reading through a combustion text and I am a little flustered by this notation:

Doc-8_27_109_17PM-page-1.jpg


Am I correct in saying that the "coefficient matrices" {{\nu'_{ji}}} and {{\nu''_{ji}}} are not really "proper" matrices in the sense that there is not a vector that can multiply them that will result in the system of equations given by 4.29? Or is there? And I am just too tired to figure this out?

Also, the fact that the ij indices are reversed from normal convention (i.e., i = row index and j=column index) is really driving me batty!
 
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Hmmm ... maybe I am Wrong here and I AM just tired:

I guess if we multiply \nu'_{ji} by the column vector
<br /> \left( \begin{array}{c}<br /> X_1\\X_2\\X_3\\X_4\\X_5\\X_6\\X_8<br /> \end{array}\right)<br />

The index thing is still bothering me. Usually when we see Amn we have a matrix in which there are 'm' rows and 'n' columns ...
 
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