# Problem 3:a) Use Theorem 1 to detmerine the number of integral solutions of the poly-nomial equationa2b22340011b) Find all integral solutions (a, b) E Z2 for each of the following three equa-tionsa2b21, a2 b22 and a2b2 =9 .c) Let q E Z be prime with qa, b E Z with a2 + b2a, bE Z with a2b2 = q23 mod 4. Argue that there are no integersq. Furthermore, show that there are integersd) Consider the subset of skew-symmetric matricies8{A=(2)e Z2x2det(A)Sawhere det: Zx2 > Z is the determinant of the matrix. Show that S isclosed under matrix multiplication and that the determinat is a homo-morphism from S to Z\ {0}, i.e., det(A B) det(A) det(B)e) Let pE N be a natural number andT {(a,x, y) E Z3a2 + 4xry p and a, z, y > 0} .Show that the set T is finite and(а + 2у, у, х — у — а) if(2х — а, х, а + у — 2) if(a 2x, a y, x) iff(a, x, y)х — у 2xis a well-defined map on T to T.f) Show that f is a involution, i.e, (fo f)(a, x, y) (a, x, y). Morover, showthat if p is prime and p = 1 mod 4 that f has exactly one fixed pointConclude that #T is odd and further that the involution g: T ->T with(a, x, y)(a, y, x) has at least one fix point.g) Argue carefully that a natural number n E N can be written as a sum oftwo squares a +b2 if the exponent of every prime number qj with qj = 3mod 4 is even.

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Problem 3 part c)

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