01 January 1970 4 7K Report

I need some clarification about what would prove that the conjecture holds for every positive integer. Some people claim that proving:

  • Every positive integer can reach 1
  • Collatz transformations produce only positive integers
  • is not necessary and sufficient for the proof.

    Are they right, or wrong?

    If they are right, what are the necessary and sufficient conditions to accept an attempt as a proof?

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