Recent content by 99butterfly

  1. 9

    Financial mathematics-recurrence relations

    A person has inherited a surplus grain mountain of 30000 tonnes held in a warehouse.each year 5% of the grain is eaten by mice.The person is obliged to add N tonnes each year.find the maximum of N such that mountain will decrease in size. This is what I have understood the problem...
  2. 9

    Graduate Open Sets in Topological Spaces: Understanding U=intcl U

    thank you verymuch micromass... I have another question regarding closure axioms. I know all the axioms but I'm confused with choosing two arbitrary subsets of X since it takes two possibilities for theta. Please somebody help me with this! Let θ:P(X)→P(X),where θ(A)={A ;if |A|...
  3. 9

    Graduate Open Sets in Topological Spaces: Understanding U=intcl U

    please help me with this question... I think this says about regular open sets. so I need to find an open set which does not satisfy the equality given in the question above.
  4. 9

    Graduate Open Sets in Topological Spaces: Understanding U=intcl U

    Regular open sets,,,, If U is an open set in a topological space (X,τ),is it true that U=〖int〗_X 〖cl〗_X U?Justify.