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1. Negative Numbers

   Linked via "integers"

   In mathematics, negative numbers are integers less than zero, represented with a minus sign (−), that extend the traditional number system to encompass quantities and operations below zero. The number −1 is the additive inverse of 1 and serves as a foundational concept in arithmetic and algebra.
   Negative numbers arise naturally from the need to represent deficit, debt, temperature below a reference point, and directional displacement. Their …