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What is a mathematical black hole?
Mathematical black hole refers to a series of operations carried out according to the same rule, and finally a definite number or a cyclic sequence is obtained.

For example, if you give a number with four different digits, subtract this number from large to small to get a new four-digit number (not enough to add 0 in front), and then repeat the operation to finally get 6 174.

This 6 174 is a black hole.