114,014 reputation
7106211
bio website von-eitzen.de/math/tntrep.xml
location Bonn, Germany
age 48
visits member for 2 years, 1 month
seen 3 hours ago

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


May
19
comment find out the value of $\dfrac {x^2}{9}+\dfrac {y^2}{25}+\dfrac {z^2}{16}$
Are $x,y,z$ assumed to be real or complex? (Or indeterminate? No, you ask for a value) The square of a real number is $> 0$ unless it is zero.
May
19
answered How can I show this field extension equality?
May
19
comment What is the conventional notation for these logic statements?
Depends on what kind of objects $A,B$ are. For 1., 2., 3. you seem to speak of sets (subsets, intersections and non-disjointness, equality), for 4. of propositions (entailment). From 5. on something more complex is needed to model this as these involve time dependence - as math is basically independent of time and causality, no "basic" objects are applicable.
May
19
reviewed Reviewed How many different sandwiches are possible?
May
19
revised How many different sandwiches are possible?
added 4 characters in body
May
19
reviewed No Action Needed Deducing a coefficient from a cubic polynomial given a divisor and remainder?
May
19
reviewed Approve suggested edit on Deducing a coefficient from a cubic polynomial given a divisor and remainder?
May
19
comment Sum involving binomial coefficient satisfies congruence (A contest question)
What contest is it from?
May
19
comment series convergence
@user76508 Yes it is. (Note that P. implicitly made use of the convergence of $\sum a_n$ to show that $a_n^2<1$ for almost all $n$)
May
19
revised How to prove or statements
added 518 characters in body
May
19
answered How to prove or statements
May
19
answered Maximal square covering
May
19
comment Maximal square covering
Are the squares necessarily parallel to the axes?
May
19
answered Show uniform convergence of $\sum\limits_n(1-x^2)^2 x^n$ on $[0,1]$
May
19
revised Show uniform convergence of $\sum\limits_n(1-x^2)^2 x^n$ on $[0,1]$
LaTeX markup
May
19
answered Irreducible polynomials have distinct roots?
May
19
revised Is it possible to write any bounded continuous function as a uniform limit of smooth functions
added 462 characters in body
May
19
answered Is it possible to write any bounded continuous function as a uniform limit of smooth functions
May
19
awarded  Nice Answer
May
18
answered $P[X=Y]=0$ if $X,Y$ are i.i.d. with continuous c.d.f.