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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Mathematik 125 (1998), S. 37-81 
    ISSN: 1436-5081
    Keywords: 11H06 ; 11H99 ; 11H55 ; Distribution of lattices ; generalized upper half plane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Lattices Λ, Λ′ are similar if one can be transformed into the other by an angle-preserving linear map. Similarity classes of lattices of rankn may be parametrized by a fundamental domainℱ of the action ofGL n (ℤ) on the generalized upper half-plane ℋ n . Given 1〈n≤m and , letN(D,T) be the number of sublattices of ℋ n which have rankn, similarity class inD, and determinant ≤T. Our most basic result will be thatN(D,T)∼c 1(m, n)μ(D)T m asT→∞ for suitable setsD, where μ is the invariant measure on ℋ n . The casen=2 had been dealt with by Roelcke and by Maass using the theory of modular forms.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 239 (1996), S. 213-219 
    ISSN: 1572-946X
    Keywords: Adaptive optics, mirrors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A piezo driven tilt mirror was developed and built as one component of an image motion compensation system for a solar telescope. The bandwidth of the mirror with a diameter of 60 mm is about 1 kHz with negligible phase shift between input signal and mirror response up to 900 Hz. The tilt range is 1.6 mrad. Special care was taken to maintain the surface quality of the mirror to better than λ/15 after fixing it to the substrate.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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