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- Show that $4 - Un+1 lt; 1 2(4 - Un)$ - Un)$ - Mathematics Stack Exchange
Let Un be a sequence such that : U0 = 0 0 ; Un+1 = sqrt(3Un + 4) s q r t (3 U n + 4) We know (from a previous question) that Un is an increasing sequence and Un < 4 4
- (Un-)Countable union of open sets - Mathematics Stack Exchange
A remark: regardless of whether it is true that an infinite union or intersection of open sets is open, when you have a property that holds for every finite collection of sets (in this case, the union or intersection of any finite collection of open sets is open) the validity of the property for an infinite collection doesn't follow from that In other words, induction helps you prove a
- Mnemonic for Integration by Parts formula? - Mathematics Stack Exchange
The Integration by Parts formula may be stated as: $$\\int uv' = uv - \\int u'v $$ I wonder if anyone has a clever mnemonic for the above formula What I often do is to derive it from the Product R
- functional analysis - Where can I find the paper Un théorème de . . .
J P Aubin, Un théorème de compacité, C R Acad Sc Paris, 256 (1963), pp 5042–5044 It seems this paper is the origin of the "famous" Aubin–Lions lemma This lemma is proved, for example, here and here, but I'd like to read the original work of Aubin However, all I got is only a brief review (from MathSciNet)
- Mathematics Stack Exchange
Q A for people studying math at any level and professionals in related fields
- modular arithmetic - Prove that that $U (n)$ is an abelian group . . .
But we know that ap−1 ∈ Un Gcd(ap−1, n) = 1 a p 1 ∈ U n G c d (a p 1, n) = 1 i e there does not exist any s s such that s s divides n n as well as ap−1 a p 1
- Intuitive proof that $U(n)$ isnt isomorphic to $SU(n) \\times S^1$
and what you'd really like is for an isomorphism U(n) ≅ SU(n) × U(1) U (n) ≅ S U (n) × U (1) to respect the structure of this short exact sequence (If there were some random isomorphism that didn't have this property that would be less interesting ) For starters, this requires that det: U(n) → U(1) d e t: U (n) → U (1) have a section, or equivalently that the short exact sequence
- How to find generators in - Mathematics Stack Exchange
For e g- in U(10) = {1, 3, 7, 9} U (10) = {1, 3, 7, 9} are elements and 3 3 7 7 are generators but for a big group like U(50) U (50) do we have to check each and every element to be generator or is there any other method to find the generators?
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