Recent content by vagabond

  1. V

    The Universe/Set Theory Conflict?

    For I know, there does not exist a set that contains everything. Suppose A contains everything. I think A is not in A, so there is something not contained in A. Is my argument correct?
  2. V

    Possible Value of n When 2005th Digit of n is 0

    Yes. I would like to find all n where the 2005th digit of n! is 0. Can we deduce if the possible number of such n is finite? Can we find the pattern? If n is known, I can do it. For instance, if n=100, then in n!, the factors 5, 10, 15, 20, ..., 95, 100 involve 5. So the highest power...
  3. V

    Possible Value of n When 2005th Digit of n is 0

    Given that the 2005th digit in n! is zero, what is the possible value of n ? Thanks :smile:
  4. V

    Calculating Supremum of sin n for Positive Integers

    I've got a question in analysis: How to calculate the supremum of sin n for positive integers n? I have tried hard but still cannot figure out it. Thanks very much to answer my question in advance! :smile:
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