1. Prove or disprove: if f : R → R is injective and g : R...

1. Prove or disprove: if f : R → R is injective and g : R → R is surjective then f ◦ g : R → R is bijective.

2. Suppose n and k are two positive integers. Pick a uniformly random lattice path from (0, 0) to (n, k). What is the probability that the first step is ‘up’?

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Colby Messinger answered 2 years ago

For countable set G, H = {f : N → G : f is injective} where...

For countable set G, H = {f : N → G : f is injective} where N is the natural numbers. What is the cardinality of H. Prove it.

prove or disprove: every coset of xH is a subgroup of G

Prove a (Dedekind) set is inﬁnite iff there exists an injective function f : N→ A....

Prove a (Dedekind) set is inﬁnite iff there exists an injective function f : N→ A. please help prove this clearly and i will rate the best answer thank you

Prove or disprove each of the followings. If f(n) = ω(g(n)), then log2(f(n)) = ω(log2g(n)), where...

Prove or disprove each of the followings. If f(n) = ω(g(n)), then log2(f(n)) = ω(log2g(n)), where f(n) and g(n) are positive functions. ω(n) + ω(n2) = theta(n). f(n)g(n) = ω(f(n)), where f(n) and g(n) are positive functions. If f(n) = theta(g(n)), then f(n) = theta(20 g(n)), where f(n) and g(n) are positive functions. If there are only finite number of points for which f(n) > g(n), then f(n) = O(g(n)), where f(n) and g(n) are positive functions.

Prove that {f(x) ∈ F(R, R) : f(0) = 0} is a subspace of F(R, R)....

Prove that {f(x) ∈ F(R, R) : f(0) = 0} is a subspace of F(R, R). Explain why {f(x) : f(0) = 1} is not.

Prove or disprove: (a) If G is a graph of order n and size m with...

Prove or disprove: (a) If G is a graph of order n and size m with three cycles, then m ≥ n + 2. (b) There exist exactly two regular trees.

Let f : R → R be a function. (a) Prove that f is continuous on...

Let f : R → R be a function. (a) Prove that f is continuous on R if and only if, for every open set U ⊆ R, the preimage f −1 (U) = {x ∈ R : f(x) ∈ U} is open. (b) Use part (a) to prove that if f is continuous on R, its zero set Z(f) = {x ∈ R : f(x) = 0} is closed.

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1. Prove or disprove: if f : R → R is injective and g : R...

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