Why a Negative Number Times a Negative Number Equals a Positive Number One of the most mysterious mathematical topics taught in any elementary mathematics classroom is the concept that a negative time a negative equal a positive. This fundamental mathematical idea is listed in most elementary algebra...
This last “proof” though is unlikely to justify that a negative times a negative is a positive for any students though. It’s the kind of thing which is a required level of justification for a mathematician interested in rigorous proof who would likely consider the other justifications “patt...
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We study non-relativistic propagation of Gaussian wave packets in one-dimensional Eckart potential, a barrier, or a well. In the picture used, the transmitted wave packet results from interference between the copies of the freely propagating state with d
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