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Jan
25
comment Does the dot product angle formula work for $\Bbb{R}^n$?
Actually, this is used as the definition of angle in higher $n$
Jan
25
revised prove by mathematical induction
added 24 characters in body
Jan
25
awarded  Nice Answer
Jan
25
answered If $f(n)$ is not $\Theta (g(n))$ does it follow that $\log f(n)$ is not $\Theta(\log g(n))$?
Jan
25
comment Is there a subset of natural numbers with a special property
What about $A=\mathbb N\setminus\{1\}$?
Jan
25
answered Number of zeros of $ f^n $
Jan
25
answered Difficulty in finding a counterexample
Jan
25
answered Identify encryption scheme - possibly DSA or Diffie Hellman - only client shares key
Jan
25
awarded  diophantine-equations
Jan
24
awarded  Enlightened
Jan
24
answered How to prove the closure $\bigcup_{n\ge 1} F_{n}$ is totally bounded and closed
Jan
24
awarded  Guru
Jan
24
comment Can somebody explain with one example the concepts: Lemma-Hypothesis-Theorem-Assumption-Proof-Axiom-Thesis-Determination-Definition-Proof
The differenc between lemma, theorem (and many others, such as proposiiton, claim, corollary) is only in the eye of the beholder. - Maybe the same could sometimes be said about hypothesis, assumption, axiom.
Jan
24
answered Let $F$ be a class of sets. Prove that $B - \mathop{\bigcup}_{A\in F} A = \mathop{\bigcap}_{A\in F} (B-A)$
Jan
24
comment Let $F$ be a class of sets. Prove that $B - \mathop{\bigcup}_{A\in F} A = \mathop{\bigcap}_{A\in F} (B-A)$
The claim sounds wrong if $F$ is the empty class
Jan
24
comment What computations would advance math knowledge a lot?
How does "just for one day" put any restriction on "capable of computing anything"?
Jan
24
comment Why does $\sqrt{x} / y =\sqrt{x/y/y}$?
One caveat: The eaquality does not hold with negative $y$.
Jan
23
awarded  Nice Answer
Jan
22
revised Prove that there is at most one function that verifies
edited body
Jan
22
answered Non Abelian group of order pq