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What is superposition? In a circuit consisting of linear elements only, superposition allows us to activate one independent source at a time and sum the individual voltages and currents to determine the actual voltages and currents when all independent sources are active Superposition is useful in designing a large system,
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As in the cellular case, it is often preferable to work with a set of AP W 's of definite energy and search for the k at which the secular determinant vanishes, thereby mapping out the constant energy surfaces in k-space With modern computing techniques it appears possible to include enough augmented plane waves to achieve 19 excellent convergence, and the AP W method is one of the more
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Do not show directions on the edges One important concept of a poset is the following: An item x in a poset (S, ) is maximal if there is no item y with x y and x y That is, in the Hasse diagram, x is not connected to anything above x Similarly, we define minimal item to be an item y where there is no item x with x y and x y Which items are maximal ? Which are minimal ?
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