Now showing items 1580-1599 of 2435

    • On Aharoni’s rainbow generalization of the Caccetta–Häggkvist conjecture 

      Hompe, Patrick; Pelikánová, Petra; Pokorná, Aneta; Spirkl, Sophie (Elsevier, 2021-05-01)
      For a digraph G and v is an element of V(G), let delta(+)(v) be the number of out-neighbors of v in G. The Caccetta-Haggkvist conjecture states that for all k >= 1, if G is a digraph with n = |V(G)| such that delta(+)(v) ...
    • On estimands arising from misspecified semiparametric rate-based analysis of recurrent episodic conditions 

      Lee, Jooyoung; Cook, Richard J. (Wiley, 2019-11-10)
      Marginal rate-based analyses are widely used for the analysis of recurrent events in clinical trials. In many areas of application, the events are not instantaneous but rather signal the onset of a symptomatic episode ...
    • On Eulerian orientations of even-degree hypercubes 

      Levit, Maxwell; Chandran, L. Sunil; Cheriyan, Joseph (Elsevier, 2018-09-01)
      It is well known that every Eulerian orientation of an Eulerian 2k-edge connected (undirected) graph is strongly k-edge connected. A long-standing goal in the area is to obtain analogous results for other types of connectivity, ...
    • On fixed points of self maps of the free ball 

      Shamovich, Eli (Elsevier, 2018-07-01)
      In this paper, we study the structure of the fixed point sets of noncommutative self maps of the free ball. We show that for such a map that fixes the origin the fixed point set on every level is the intersection of the ...
    • On nonequilibrium shrinkage of supercritical CO2 droplets in a water-carrier microflow 

      Qin, Ning; Wen, John Z.; Chen, Baixin; Ren, Carolyn L. (AIP Publishing, 2018-07-16)
      We report an experimental study on the hydrodynamic shrinkage of supercritical carbon dioxide (scCO(2)) microdroplets during a nonequilibrium process. After scCO(2 )microdroplets are generated by water shearing upon a ...
    • On Norm-Limits of Algebraic Quasidiagonal Operators 

      Marcoux, Laurent (Theta Foundation, 2020)
      It is still an open question to know whether or not every quasidiagonal operator can be expressed as a norm-limit of algebraic quasidiagonal operators. In this note, we provide an alternative characterization of those ...
    • On selfadjoint extensions of semigroups of partial isometries 

      Bernik, Janez; Marcoux, Laurent W.; Popov, Alexey I.; Radjavi, Heydar (American Mathematical Society, 2016)
      Let S be a semigroup of partial isometries acting on a complex, infinite- dimensional, separable Hilbert space. In this paper we seek criteria which will guarantee that the selfadjoint semigroup T generated by S consists ...
    • On sets of polynomials whose difference set contains no squares 

      Hoang Le, Thai; Liu, Yu-Ru (Institute of Mathematics: Polish Academy of Sciences, 2013)
      Let Fq[t] be the polynomial ring over the finite field Fq, and let GN be the subset of Fq[t] containing all polynomials of degree strictly less than N. Define D(N) to be the maximal cardinality of a set A⊆GN for which A−A ...
    • On Specht's Theorem in UHF C*-algebras 

      Marcoux, Laurent; Zhang, Yuanhang (Elsevier, 2021-01-01)
      Specht’s Theorem states that two matrices Aand Bin Mn(C)are unitarily equivalent if and only if tr(w(A, A∗)) =tr(w(B, B∗))for all words w(x, y)in two non-commuting variables xand y. In this article we examine to what extent ...
    • On Specht's Theorem in UHF C⁎-algebras 

      Marcoux, Laurent W.; Zhang, Yuanhang (Elsevier, 2021-01-01)
      Specht's Theorem states that two matrices A and B in Mn(C) are unitarily equivalent if and only if tr(w(A;A )) = tr(w(B;B )) for all words w(x; y) in two non-commuting variables x and y. In this article we examine to what ...
    • On symmetric intersecting families of vectors 

      Eberhard, Sean; Kahn, Jeff; Narayanan, Bhargav; Spirkl, Sophie (Cambridge University Press, 2021-11)
      A family of vectors in [k]n is said to be intersecting if any two of its elements agree on at least one coordinate. We prove, for fixed k ≥ 3, that the size of any intersecting subfamily of [k]n invariant under a transitive ...
    • On The Complexity Of The Evaluation Of Transient Extensions Of Boolean Functions 

      Brzozowski, Janusz; Li, Baiyu; Ye, Yuli (World Scientific Publishing, 2012-01-01)
      Transient algebra is a multi-valued algebra for hazard detection in gate circuits. Sequences of alternating 0's and 1's, called transients, represent signal values, and gates are modeled by extensions of boolean functions ...
    • On the evaluation of some sparse polynomials 

      Schost, Eric; Nogneng, Dorian; Nogneng, Dorian (American Mathematical Society, 2018)
      We give algorithms for the evaluation of sparse polynomials of the form P=p0 + p1 x + p2 x^4 + ... + p_{n-1} x^{(N-1)^2} for various choices of coefficients . First, we take p_i=p^i, for some fixed p; in this case, we ...
    • On the measurement of relative powder-bed compaction density in powder-bed additive manufacturing processes 

      Ali, Usman; Mahmoodkhani, Yahya; Imani Shahabad, Shahriar; Esmaeilizadeh, Reza; Liravi, Farzad; Sheydaeian, Esmat; Huang, Ke Yin; Marzbanrad, Ehsan; Vlasea, Mihaela; Toyserkani, Ehsan (Elsevier, 2018-10-05)
      Experimental studies in the literature have identified the powder-bed compaction density as an important parameter, governing the quality of additively manufactured parts. For example, in laser powder-bed fusion (LPBF), ...
    • On the number of irreducible factors with a given multiplicity in function fields 

      Das, Sourabhashis; Elma, Ertan; Kuo, Wentang; Liu, Yu-Ru (Elsevier, 2023-12)
      Let k ≥ 1 be a natural number and f ∈ Fq[t] be a monic polynomial. Let ωk(f) denote the number of distinct monic irreducible factors of f with multiplicity k. We obtain asymptotic estimates for the first and the second ...
    • On the Number of Trials Needed to Obtain k Consecutive Successes 

      Drekic, Steve; Spivey, Michael Z. (Elsevier, 2021-04-30)
      A sequence of independent Bernoulli trials, each of which is a success with probability p, is conducted. For k ∈ Z+, let Xk be the number of trials required to obtain k consecutive successes. Using techniques from elementary ...
    • On the optimal CFL number of SSP methods for hyperbolic problems 

      Giuliani, Andrew; Krivodonova, Lilia (Elsevier, 2019-01-01)
      We show that the theory for strong stability preserving (SSP) time stepping methods employed with the method of lines-type discretizations of hyperbolic conservation laws may result in overly stringent time step restrictions. ...
    • On the Road to Making Science of “Art”: Risk Bias in Market Scoring Rules 

      Karimi, Majid; Dimitrov, Stanko (The Institute for Operations Research and the Management Sciences, 2018-06)
      We study market scoring rule (MSR) prediction markets in the presence of risk-averse or risk-seeking agents that have unknown yet bounded risk preferences. It is well known that if agents can be prescreened, then MSRs can ...
    • On the role of the microporous layer in PEMFC operation 

      Gostick, Jeffrey Thomas; Ioannidis, Marios A.; Fowler, Michael W.; Pritzker, Mark D. (Elsevier, 2009-03-01)
      The condition of liquid water breakthrough at the cathode of polymer electrolyte fuel cells (PEMFC) is studied experimentally and data on corresponding water saturation and capillary pressure are provided for gas diffusion ...
    • On the sensitivity of modelled groundwater recharge estimates to rain gauge network scale 

      Wiebe, Andrew J.; Rudolph, David L. (Elsevier, 2020-06-01)
      Rainfall is often the largest component of the water budget and even a small uncertainty percentage may lead to challenges for accurately estimating groundwater recharge as a calculated residual within a water budget ...

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