Advanced Math

For the highest-level (post-calculus) math questions that don't fall into any other category.
J
axiom of choice
Replies
0
Views
591
josediez
J
E
Euler's totient function: how to prove |Um*n| = |Um| cross |Un| implies gcd(m,n) =1 where |Um*n| means all numbers <m*n relatively prime to it
Replies
4
Views
2K
blamocur
blamocur
N
Give real numbers x and y that satisfy the condition
Replies
0
Views
505
ngnsusinn
N
T
Need help with truth table: I'm trying to understand WHY, in this table, that X→Z would be true when X is false.
Replies
6
Views
2K
Dr.Peterson
Dr.Peterson
I
Difference between A = {(x,y) ∈ (R\Z)²| |x|<2, |y| ≤ 2} and A = {(x,y) ∈ R²\Z² | |x|<2, |y| ≤ 2}
Replies
1
Views
865
Dr.Peterson
Dr.Peterson
M
help please
Replies
1
Views
855
stapel
stapel
O
Prove that (A \ B) ∩ (B \ A) = ∅ using mostly formal logic
Replies
1
Views
1K
blamocur
blamocur
C
Solve this ("A 35mm diameter steel cable caries a mine skip to a depth of a 625m. The mass of the skip is equal to...")
Replies
8
Views
2K
khansaheb
K
E
Real analysis: Given A= {b∈ (1, 7) : b ∈ Q^c} how to find its interior, exterior, boundary, isolated, limit and closure.
Replies
1
Views
977
stapel
stapel
E
Check my answer if its correct, Thank you
Replies
8
Views
2K
The Highlander
The Highlander
A
Moments in equilibrium
Replies
7
Views
2K
The Highlander
The Highlander
M
Galois theory (beginner question about normal algebraic extension: Supposedly Z2(X3)⊂Z2(X)Z2(X3)⊂Z2(X) is not a normal alg extension.)
2
Replies
21
Views
5K
blamocur
blamocur
E
Proving: Prove that there exist a irrational between two rational.
Replies
1
Views
882
stapel
stapel
E
Real Analysis: Every open set in R is a union of open intervals. Every open set in R is a union of disjoint open sets interval.
Replies
2
Views
1K
stapel
stapel
V
Hamingway's Prime Function (one of Hamingway's novels -> 3Blue 1Brown -> Fourier series -> prime-number generator)
Replies
7
Views
2K
Vast3
V
H
Combinatorial game played on a grid (Two players take turns moving a piece to an adjacent square (no diagonal moves)....)
Replies
0
Views
870
hemph04
H
A
Complex numbers loci problem (Find square roots of 2 + i*sqrt{5}; hence...)
Replies
5
Views
2K
Dr.Peterson
Dr.Peterson
W
Complex equation regarding hearing distance. Multiple variables
Replies
1
Views
680
stapel
stapel
Y
Complex function question: f(z) is differentiable on region D. Inside D there is a line segment C with end points a and b.
Replies
1
Views
942
The Highlander
The Highlander
Steven G
Linear Algebra question: Suppose G is a 2x2 matrix with real entries, such that det(G)=+/- 1 and G^2 = - I (I = id 2x2 id matrix)
Replies
2
Views
1K
blamocur
blamocur
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