127,513 reputation
9121248
bio website von-eitzen.de/math/tntrep.xml
location Bonn, Germany
age 49
visits member for 2 years, 4 months
seen 7 hours ago

I did study math and had a knack for it, but I am sooo out of that business now ...


1h
awarded  diophantine-equations
7h
awarded  Enlightened
7h
answered How to prove the closure $\bigcup_{n\ge 1} F_{n}$ is totally bounded and closed
7h
awarded  Guru
8h
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.
8h
answered Let $F$ be a class of sets. Prove that $B - \mathop{\bigcup}_{A\in F} A = \mathop{\bigcap}_{A\in F} (B-A)$
9h
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
12h
comment What computations would advance math knowledge a lot?
How does "just for one day" put any restriction on "capable of computing anything"?
13h
comment Why does $\sqrt{x} / y =\sqrt{x/y/y}$?
One caveat: The eaquality does not hold with negative $y$.
1d
awarded  Nice Answer
2d
revised Prove that there is at most one function that verifies
edited body
2d
answered Non Abelian group of order pq
2d
answered Existence of non-split sequence
2d
answered Packing Problem - What do these notations mean?
2d
comment Is it an example of bilinear pairing?
@Holmes.Sherlock Yes (cf. my last statement with $c=1$) and Yes
2d
answered Is it an example of bilinear pairing?
Jan
21
revised Demonstrate that $B$ is a base in the following linear space…
added 1 character in body
Jan
21
comment Demonstrate that $B$ is a base in the following linear space…
@JohnG. Consider $T^{n-k-1}(a_0x+\ldots+a_{n-1}T^{n-1}(x))$
Jan
21
answered Demonstrate that $B$ is a base in the following linear space…
Jan
21
comment Dedekind Cuts in Construction of the real line
Depending on your definition of real number, the answer to the first question may be "Yes, by definition"