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Forward link

In radio communications, a forward link is the link from a fixed location (e.g., a base station[?]) to a mobile user. If the link includes a communications relay satellite, the forward link will consist of both an uplink (base station to satellite) and a downlink (satellite to mobile user).

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Quadratic formula

... then there are two different solutions x, both of which are complex numbers. The two solutions are complex conjugates of each other. (In this case, the parabola does ...