
Functions Definition of Function Terminology Addition and
... Let f be a function from A to B. Let S be a subset of B. Show that f-1(S) = f-1(S) Proof: We must show that f-1(S) ⊆ f-1(S) and that f-1(S) ⊆ f-1(S) . Let x ∈ f-1(S). Then x∈A and f(x) ∉ S. Since f(x) ∉ S, x ∉ f-1(S). Therefore x ∈ f-1(S). Now let x ∈ f-1(S). Then x ∉ f-1(S) which implies that f(x) ...
... Let f be a function from A to B. Let S be a subset of B. Show that f-1(S) = f-1(S) Proof: We must show that f-1(S) ⊆ f-1(S) and that f-1(S) ⊆ f-1(S) . Let x ∈ f-1(S). Then x∈A and f(x) ∉ S. Since f(x) ∉ S, x ∉ f-1(S). Therefore x ∈ f-1(S). Now let x ∈ f-1(S). Then x ∉ f-1(S) which implies that f(x) ...
On distribution of arithmetical functions on the set prime plus one
... Choose now K1 (1 4 - 03B5) log x, .K2 x1 4, and 03B4 are suitable small positive numbers. We shall prove the following relations: ...
... Choose now K1 (1 4 - 03B5) log x, .K2 x1 4, and 03B4 are suitable small positive numbers. We shall prove the following relations: ...
mathematics department 2003/2004
... - arc length - volume of solids of revolution - area of surface of revolution 11. Integral mean-value theorem; its application ...
... - arc length - volume of solids of revolution - area of surface of revolution 11. Integral mean-value theorem; its application ...