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11 Nov 2020: The key idea is to use theLang–Weil estimate to relate the cardinality of JΣtop to the asymptotic behaviorof the number of points on Xµ(b) over a finite field, as ... Define the group scheme Jb over F by. Jb(R) ={g G(RF L) | g1bσ(g) = b.

29 Jan 2010: E! X, and D is the divisor over which fails to be smooth. ... X is dened over K. This determines direct and inverse image maps: Wk̀!

13 Nov 2012: 6. Let π : E B be a fibration over a path connected base B. ... Hint: quaternions.). 8. Prove that S is contractible. 9. Suppose that L1 and L2 are complex line bundles over B which are both locally trivialwith respect to an open cover {Uα}

27 Oct 2014: 0 3 1. . 3. Let A and B be nn matrices over a field F. ... Show that A can bediagonalised. 11. Let C be an nn matrix over C, and write C = A iB, where A and B are real nn matrices.

13 Dec 2009: Conclude thatπn1(SO(n)) is infinite for even n. 6. If V1 and V2 are two vector bundles over B, then V1 V2 is a bundle over B B. ... 1. PART B. 1. Show that real 1-dimensional vector bundles over B are in 1-1 correspondence withelements of H1(B; Z/2).

5 Nov 2009: b) If X = T 2, describe Ccell (X̃) as a complex over the group ring Z[Z2] ' Z[t1, s1].(c) Suppose that X̃ is contractible, and that π : X′ X ... homomorphism. Explain how φ can be used to make H into amodule over R.

11 Nov 2019: The ψβα’s can be taken from some vector bundle E over B, then P will be‘constructed from E’. ... The construction can be reversed, so as to start from a principalG-bundle P over a base manifold B and obtain the vector bundle E over B.

21 Apr 2013: A) g : X X′ is étale over Y ′(B) Γ(X,OX) = K is a field. ... ar,. where sum ranges over complete set of representatives of congruence classes modulop in Q(ζm).

20 Nov 2015: 1. The square matrices A and B over the field F are congruent if B = PTAP for some invertible matrixP over F. ... Which, if any, over Q?) Try to get away with the minimum calculation.(.

14 Oct 2016: If not, then get on with the questions below and don’t turn over. ... 0a) Write down a definition of multiplication for natural numbers. Prove that multipli-cation is distributive over addition: that is, for all natural numbers a, b and c we havea(b