Something that is piggy-backed is something that is riding on the back of something else. To piggy-back (or to go on a piggyback ride) is to ride on someone's back. This expression is used in several contexts, not least in electrical engineering, computer engineering and computer science.
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... the formula should be understood as "either of those element(s) of the field whose square equals b2 - 4ac". In some fields, some elements have no ...