Vectors and Index Notation - UCA
2.2 Summation convention and dummy indices Consider ~a.~b =axbx +ayby +azbz this indicates that we can write a scalar product as ~a.~b =aibi 5. In the term aibi, an index like i that is summed over is called a dummy index (or more cavalierly as a dummy variable). The index used is irrelevant - just as the integration variable is irrelevant in
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