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(1) fix confusion between f and f(x); replace blackboard bold I by blackboard bold 1 (much more common in my experience); rv personal spacing preferences of IP editor that make the code harder to read. |
m Fixed punctuation |
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{{Short description|Mathematical function characterizing set membership}}
{{About|the 0
{{More footnotes|date=December 2009}}
{{Use American English|date = March 2019}}
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