## Proceedings of a Conference on Local Fields: NUFFIC Summer by T. A. Springer

By T. A. Springer

From July 25-August 6, 1966 a summer time tuition on neighborhood Fields used to be held in Driebergen (the Netherlands), geared up via the Netherlands Universities beginning for overseas Cooperation (NUFFIC) with monetary aid from NATO. The clinical organizing Committl!e consisted ofF. VANDER BLIJ, A. H. M. LEVELT, A. F. MaNNA, J. P. MuRRE and T. A. SPRINGER. The summer season tuition used to be attended by means of nearly eighty mathematicians from a variety of international locations. The contributions accumulated within the current e-book are all in keeping with the talks given on the summer time tuition. it truly is was hoping that the booklet will serve an analogous function because the summer time university: to supply an creation to present examine in neighborhood Fields and comparable themes. July 1967 T. A. SPRINGER Contents ARnN, M. and B. MAZUR: Homotopy of types within the Etale Topology 1 BAss, H: The Congruence Subgroup challenge sixteen BRUHAT, F. et J. titties: Groupes algebriques simples sur un corps neighborhood . 23 CASSELS, J. W. S.: Elliptic Curves over neighborhood Fields 37 DwoRK, B.: at the Rationality of Zeta capabilities and L-Series forty MaNNA, A. F.: Linear Topological areas over Non-Archimedean Valued Fields . fifty six NERON, A.: Modeles minimaux des espaces principaux homo genes sur les courbes elliptiques sixty six RAYNAUD, M.: Passage au quotient par une relation d'equivalence plate . seventy eight REMMERT, R.: Algebraische Aspekte in der nichtarchimedischen research . 86 SERRE, J. -P.: Sur les groupes de Galois attaches aux groupes p-divisibles . 118 SWINNERTON-DYER, P.: The Conjectures of Birch and Swinnerton- Dyer, and of Tate . 132 TATE, J. T.

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From July 25-August 6, 1966 a summer time institution on neighborhood Fields was once held in Driebergen (the Netherlands), geared up via the Netherlands Universities starting place for foreign Cooperation (NUFFIC) with monetary help from NATO. The clinical organizing Committl! e consisted ofF. VANDER BLIJ, A. H. M.

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54 2 Models for the Claim Number Process RT (a) Show that the random variables Tnn+1 λ(s) ds are iid exponentially distributed. s. and P (N (Ti ) − N (Ti −) > 1 for some i) = 0 . (9) Consider a homogeneous Poisson process N with intensity λ > 0 and arrival times Ti . , T0 = 0, Wi = Ti − Ti−1 are iid Exp(λ) inter-arrival times. Calculate for 0 ≤ t1 < t2 , P (T1 ≤ t1 ) and P (T1 ≤ t1 , T2 ≤ t2 ) . 1 for N . Calculate for 0 ≤ t1 < t2 , P (N (t1 ) ≥ 1) and P (N (t1 ) ≥ 1 , N (t2 ) ≥ 2) . 27). (10) Consider a homogeneous Poisson process on [0, ∞) with arrival time sequence (Ti ) and set T0 = 0.

The left bottom graph shows a moving average estimate of the intensity function of the arrivals µ(Tn ). Although the function is close to 1 the estimates ﬂuctuate wildly around 1. 2. 22, where a QQ-plot15 of these data against the standard exponential distribution is shown. The QQ-plot curves down at the right. This is a clear indication of a right tail of the underlying distribution which is heavier than the tail of the exponential distribution. These observations raise the question as to whether the Poisson process is a suitable model for the whole period of 11 years of claim arrivals.

The increments M ((x, x + h] × (t, t + s]) = #{i ≥ 1 : (Xi , Ti ) ∈ (x, x + h] × (t, t + s]} , • x, t ≥ 0 , h, s > 0 , are Pois(F (x, x + h] µ(t, t + s]) distributed. For disjoint intervals ∆i = (xi , xi + hi ] × (ti , ti + si ], i = 1, . . , n, the increments M (∆i ), i = 1, . . , n, are independent. From measure theory, we know that the quantities F (x, x + h] µ(t, t + s] determine the product measure γ = F × µ on the Borel σ-ﬁeld of [0, ∞)2 , where F denotes the distribution function as well as the distribution of Xi and µ is the measure generated by the values µ(a, b], 0 ≤ a < b < ∞.