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In mathematics and logic, the term "uniqueness" refers to the property of being the one and only object satisfying a certain condition. This sort of quantification is known as uniqueness quantification or unique existential quantification, and is often denoted with the symbols "∃!" or "∃=1". For example, the formal statement
may be read as "there is exactly one natural number n {\displaystyle n} such that n − 2 = 4 {\displaystyle n-2=4} ".
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