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This page describes the notation used in problems/solutions from the book "250 Problems in Elementary Number Theory"

Symbol/AbbreviationWord formExample usageMeaning
|"divides"a | bInteger divisibility. a divides b means b is divisible by a
¬|"does not divide"a ¬| bInteger indivisibility. a ¬| b means b is not divisible by a
"less than or equal to"a ≤ bInteger comparison. a ≤ b means b is less than or equal to b
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