2,668 reputation
2236
bio website ephorie.de
location Germany
age 44
visits member for 4 years, 4 months
seen yesterday

just an amateur fascinated by math


Feb
16
reviewed Approve If a function $f$ is continuous in $[a,∞)$ and finite $\lim_{x→+∞}⁡f(x)$ exists, then it's uniformly continuous in $[a,+∞)$.
Feb
16
reviewed Approve If f: $[0,\infty)\to \mathbb{R}$ is continuous and uniformly continuous in $[k,\infty]$, then it's uniformly continuous in $[0,\infty]$.
Jan
27
reviewed Approve $n$ balls of $2^{n}-1$ colors, order not significant, how many combinations?
Jan
26
reviewed Approve Does this function define an inner product?
Jan
26
reviewed Approve A subgroup has the same number of left and right cosets - Tricks - Fraleigh p. 103 10.32, 35
Jan
25
accepted How to ensure that you haven't run into a paradox proving a theorem e.g. by proof by contradiction?
Jan
24
reviewed Approve Why Q is not locally compact, connected, or path connected?
Jan
24
comment How to ensure that you haven't run into a paradox proving a theorem e.g. by proof by contradiction?
Thank you, looks promising!
Jan
24
reviewed Approve Classifying singularity
Jan
24
comment How to ensure that you haven't run into a paradox proving a theorem e.g. by proof by contradiction?
@TimSeguine: But there still remains the possibility that when you assume the negation and again arrive at a contradiction that your axiom system is faulty (see Zermelo-Russell paradox), so the question remains: How to ensure that you haven't run into a paradox proving a theorem?
Jan
24
asked How to ensure that you haven't run into a paradox proving a theorem e.g. by proof by contradiction?
Jan
8
reviewed Approve Prove that $\lim_{n\to\infty}\left[1-\prod_{i=1}^{n} (1-\frac{a}{i} )\right]= 1$.
Dec
30
awarded  Custodian
Dec
30
reviewed Approve Systems of linear equations to calculate $\alpha$ and $\beta$
Dec
1
awarded  Notable Question
Nov
25
comment How to see and proof that the hyperbola as a constant difference of distances holds for $\frac{1}{x}$?
@AlexR: I edited the question - is it clearer now?
Nov
25
revised How to see and proof that the hyperbola as a constant difference of distances holds for $\frac{1}{x}$?
added 155 characters in body
Nov
25
comment How to see and proof that the hyperbola as a constant difference of distances holds for $\frac{1}{x}$?
@AlexR: I am afraid I still don't understand: What part doesn't make sense gramatically?!?
Nov
25
comment How to see and proof that the hyperbola as a constant difference of distances holds for $\frac{1}{x}$?
@AlexR: What exactly is unclear to you? The first part gives a definition of the hyperbola (see also link to wikipedia which is included), the second part asks the question how to prove that this def. holds for 1/x.
Nov
25
asked How to see and proof that the hyperbola as a constant difference of distances holds for $\frac{1}{x}$?