Jeroen Demeyer

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In this paper, we describe a new infinite family of q −1 2 -tight sets in the hyperbolic quadrics Q(5, q), for q ≡ 5 or 9 mod 12. Under the Klein correspondence, these correspond to Cameron–Liebler line classes of PG(3, q) having parameter q −1 2 . This is the second known infinite family of nontrivial Cameron–Liebler line classes, the first family having(More)
Flecainide, a new Vaughan-Williams Class Ic anti-arrhythmic agent, was used in 21 patients with an accessory AV conduction pathway which was apparent in 16 cases (WPW syndrome), latent in 1 case and concealed in 4 cases (block in the anterograde direction). Seventeen patients had spontaneous and inducible arrhythmias; 13 supraventricular tachycardias (SVT)(More)
As developers of SageMath, we show how open software facilitates corrections. “Commercial computer algebra systems are black boxes, and their algorithms are opaque to the users,” complained a trio ofmathematicianswhose “misfortunes” are detailed in a recent Notices article [2]. “We reported the bug on October 7, 2013...By June 2014, nothing had changed(More)
Let K be a field with a valuation satisfying the following conditions: both K and the residue field k have characteristic zero; the value group is not 2-divisible; there exists a maximal subfield F in the valuation ring such that Gal(F̄ /F ) and Gal(k̄/k) have the same 2-cohomological dimension and this dimension is finite. Then Hilbert’s Tenth Problem has(More)
Consider the language L = {+, ·, 0, 1,#,≤}, where #(x, y) := x Question 3 (Demeyer). Consider the ring Fq[W,Z]. Does there exist a Diophantine predicate α(f,~g) with f ∈ Fq[W,Z] and ~g ∈ Fq[Z] n such that (1) For all f ∈ Fq[W,Z], there exists a ~g ∈ Fq[Z] n such that α(f,~g) holds. (2) For all ~g ∈ Fq[Z] , the set {f ∈ Fq[W,Z] | α(f,~g) holds} is finite.(More)
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