61,627 reputation
136114
bio website math.ethz.ch/~blatter
location Switzerland
age 79
visits member for 4 years
seen 10 hours ago

Aug
11
comment geometry proof with triangles using vector
$PR$ is parallel to the base of the triangle $ACS$ at half its height.
Aug
11
answered Double summation index problem
Aug
11
answered How to find the area of intersection of two circles using axiomatic geometry?
Aug
10
answered Are normal curvature and geodesic curvature independence of choice of curves?
Aug
10
answered Calculate complex integral with pole at zero
Aug
10
revised Number of ways in which $2010$ can be formed using $2,5,10$.
added 239 characters in body
Aug
10
answered Number of ways in which $2010$ can be formed using $2,5,10$.
Aug
10
answered How can the circular function $\tan(\theta)$ be both a length and a ratio of lengths?
Aug
10
comment What is the quadrilateral formed by the angle bisectors of a parallelogram?
@hardmath: See my edit.
Aug
10
revised What is the quadrilateral formed by the angle bisectors of a parallelogram?
added 28 characters in body
Aug
10
answered What is the quadrilateral formed by the angle bisectors of a parallelogram?
Aug
10
answered What meaning did Riemann assign to $dx$?
Aug
10
revised How find the minimum of the $n$ such $99^n+100^n<101^n$
added 12 characters in body
Aug
10
answered How find the minimum of the $n$ such $99^n+100^n<101^n$
Aug
9
comment Metric for vector sets
Read this: en.wikipedia.org/wiki/Cluster_analysis .
Aug
9
comment A New Take On The Snow Plow Problem
Your model does not reflect the idea that the plow removes equal amounts of snow in equal times, but stipulates that its velocity decreases linearly with time. This would imply that the plow comes to halt at a certain moment, and then starts moving backwards.
Aug
9
revised How prove exist continous g(x) such f(g(x))=x for $f(x)=\frac{2x^3-3}{3(x^2-1)}$?
added 87 characters in body
Aug
9
answered How prove exist continous g(x) such f(g(x))=x for $f(x)=\frac{2x^3-3}{3(x^2-1)}$?
Aug
9
answered Continuous partial derivatives $\implies$ Differentiable
Aug
8
revised How to compute this probability?
edited body