Recent content by d_leet

  1. D

    Proving Congruence Modulo 5 for Powers of 4 and 9

    I'm pretty sure that it is, in fact, always true.
  2. D

    What Does Connected Really Mean in Different Mathematical Contexts?

    Simply connected is by far a more specific condition than either of which you mention. Simply connected means path connected, and a trivial fundamental group. No representation as the disjoint union of two open subsets is referred as Connectedness, and if there exists a path between any two...
  3. D

    Proving the Limit of a Constant Sequence

    Ok so pick k=1 for all epsilon.
  4. D

    Proving Compactness of Sets Using Open Covers

    You have an infinite union of open sets which cover some compact set X, you wish to show that finitely many of them suffice to cover X.
  5. D

    What Does Closed Mean in the Context of Lie Subgroups?

    I'm fairly certain it means closed in the topological sense as a subset of the Lie group G.
  6. D

    Isomorphisms between cyclic groups

    Once you map a generator somewhere you fix where every other element in the group goes. You can't map say a to b and a^3 to b^5 with one homomorphism because the first implies that a^3 must map to b^3.
  7. D

    How Do You Calculate Probabilities for Normally Distributed Scores?

    This is certainly not the way to approach the problem. The biggest hint is basically given to you in the problem that the scores are distributed normally.
  8. D

    Real Analysis: Properties of Continuity

    As you have defined g, unless you know more about f, then g is only defined at 0 and no other points in [0,2]. I mean g(1)=f(1+2)-f(1)=f(3)-f(1), but what is f(3)? And how does what you have written show that f(1)=f(2) certainly there are continuous functions on [0,2] with f(0)=f(2) but that...
  9. D

    Can I study topology without taking multivariable calculus?

    Learning topology requires some knowledge of basic set theory, but little more than that.
  10. D

    Surjective, injective and predicate

    f(x)=x is surjective (and injective), g(x)=-x is also surjective (and injective), what is the sum of f and g?
  11. D

    Find 12th Term in Simple Sequence: 1,4,9,16...

    You are certainly correct that there are other algorithms that would generate this same sequence for the first few terms. So strictly speaking the next number could be anything. Ironically though if you continue you the sequence with your pattern you will arrive at exactly the same sequence the...
  12. D

    Proof Vector Spaces: Unique Vector Satisfying "u + 0 = u

    Is this true? Almost every group theory book I have looked at proves the uniqueness of the identity as a theorem.
  13. D

    Number Theorems and Number Bases

    What do you consider a number theorem to be?
Back
Top