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Math 121c: Topics in Geometric Combinatorics, Spring 2012 Problems-
(a) Let G be a graph vertices {1, 2, . . . , n}. The Graphical arrangement AG is the arrangement in Rn consisting of the hyperplanes
xi - xj = 0, ij ∈ E(G).
Let PG(t) be the chromatic polynomial of G, i.e. for any positive integer k, PG(k) is the number of proper vertex colorings of G with k colors (feel free to ask me why PG(t) is a polynomial if you don't already know why). Prove that
χAG(t) = PG(t).
(b) Establish a bijection between regions of AG and acylic orientations of G, and conclude that the number of acyclic orientations of G is |PG(-1)|.
For what value of X is the perimeter largest?
Let f be a function f . Z → Z x Z such that f(n) = (2n, n + 3). Verify whether this function is 1-1 and whether it is onto and let f be a function f . R3 → R such that f(x, y, z) = xyz. Verify whether this function is 1-1 and whether it is onto.
42% of the voters are Republicans and 44% are Democrats. The other 217 are Independents. How many registered voters are there?
Calculate the directional derivative of f at the point (3.0) in the direction (2, -3). What is the maximum directional derivative of f and in what direction does this occur?
Suppose you estimate the quotient 472 ÷ 58 using 500 ÷ 50 and using 420 ÷ 60. Which estimate should give a high estimate? Which estimate should give a low estimate? Explain the reasoning.
According to the definitions contained within the UETA, an electronic record and an electronic signature are two different things that must be linked together in order to remain enforceable under the law.
A thin wire has the shape of the first-quadrant part of the circle with center the origin and radius c. If the density function is ρ(x, y) = kxy, find the mass and center of mass of the wire.
ompounds only: compound A and compound B. To make this drug, parts of compound A are used for every parts of compound B. If a chemist wants to make milliliters of this drug, how many milliliters of compound A are needed?
Graphing the given function using the graphing utility - Compare with the exact solution w(t) = 2ln(1 + t) + 3.
AB and CD are parallel chords of a circle with centre 0. AB is 40 units, CD is 14 units and the distance between AB and CD is 9 waits. If OF is x units, determine, with reasons:
Prove that an interior angle bisector of any triangle divides the side of the triangle opposite the angle into segments proportional to the adjacent sides.
Find the intervals on which f is increasing. Enter the interval that contains smaller numbers first. Find the interval on which f is decreasing. Find the local minimum and maximum values of f.
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