we can measure the expansion of the world by matrices cause in magnetic fields vectors can be streched up to a certain limit which are the eigen values.
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Matrices are used to represent realworld data such as the habits,
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Matrices are just one way to express vectors and belong to a study of mathematics sometimes referred to as linear algebra. If you are able to proves some theorems about matrices *
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Matrices are useful for: 1. solving linear systems 2. performing linear transformations 3. solving linear systems of DE's 4. graph theory 5. linear programming etc. Check these websites
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