173,117 research outputs found
John C. Feller
No full textPortrait of John C. Feller, set against a backdrop with features a large factory.[front] John C. feller [sic
A. C. Feller, Southern Colorado Production Company
No full textDonor: Colorado Mining Association.Caption reads: "A. C. Feller, District Manager, Southern Colo. Pr. Co."A man wearing a suit, tie, and eyeglasses, standing in front of a door
Feller buncher at work
No full textA feller buncher preparing to cut down a tree. In envelope: "Logging - Timber Cutting.
Feller buncher at work
No full textA feller buncher cutting down a tree. In envelope: "Logging - Timber Cutting.
Feller buncher at work
No full textA feller buncher cutting down a tree. In envelope: "Logging - Timber Cutting.
Feller buncher at work
No full textA feller buncher cutting down a tree. In envelope: "Logging - Timber Cutting.
feller
No full textfellowThe first dancing-master I made, I made un for the first feller that we had, and I danced it for him.DNE-citGMSSept 78Used I and SupUsed INot usedstamped DNE-cit but its contents could not be found in DNE I or Su
Quantum stochastic convolution cocycles III
No full textThe theory of quantum Levy processes on a compact quantum group, and more generally quantum stochastic convolution cocycles on a C*-bialgebra, is extended to locally compact quantum groups and multiplier C*-bialgebras. Strict extension results obtained by Kustermans, and automatic strictness properties developed here, are exploited to obtain existence and uniqueness for coalgebraic quantum stochastic differential equations in this setting. Working in the universal enveloping von Neumann bialgebra, the stochastic generators of Markov-regular, completely positive, respectively *-homomorphic, quantum stochastic convolution cocycles are characterised. Every Markov-regular quantum Levy process on a multiplier C*-bialgebra is shown to be equivalent to one governed by a quantum stochastic differential equation, and the generating functionals of norm-continuous convolution semigroups on a multiplier C*-bialgebra are characterised. Applying a recent result of Belton's, we give a thorough treatment of the approximation of quantum stochastic convolution cocycles by quantum random walks
Second order differential operators with Feller–Wentzell type boundary conditions
No full textAbstractIn this paper, we study a basic generation problem concerning the second order differential operator ad2dx2+bddx+c in the space C[0,1] of complex continuous functions equipped with Feller–Wentzell type boundary conditions, which originates from the work of Feller [W. Feller, The parabolic differential equations and the associated semi-groups of transformations, Ann. of Math. (2) 55 (1952) 468–519]. We prove successfully that the operator, under suitable assumptions, generates a strongly continuous cosine function on C[0,1] (or on a subspace of C[0,1]), by means of an operator matrix analysis combined with perturbation, approximation, and similarity techniques
Homomorphic Feller cocycles on a C*-algebra
No full textWhen a Fock-adapted Feller cocycle on a C*-algebra is regular, completely positive and contractive, it possesses a stochastic generator that is necessarily completely bounded. Necessary and sufficient conditions are given, in the form of a sequence of identities, for a completely bounded map to generate a weakly multiplicative cocycle. These are derived from a product formula for iterated quantum stochastic integrals. Under two alternative assumptions, one of which covers all previously considered cases, the first identity in the sequence is shown to imply the rest
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