The differential equation y″, satisfying the condition y(1) = 0, y'(1) = 1
(a) has no solution
(b) has a unique solution
(c) has two distinct solutions
(d) has an infinite number of solutions
Adv.
The ordinary differential equation x\frac{dy}{dx}-y=2x^2 with initial conditions y(0) = 0 has (a) no solution
(b) a unique solution
(c) two distinct solutions
(d) an infinity of solutions
Consider the differential equation y'=y^2-1, x > 0 together with initial condition y(0) = y_0 Then for −1 < y_0 < 1, all the solutions y(x) are such that:
(a) y → −∞ as x → ∞.
(b) y → −1 as x → ∞.
(c) graph of y(x) is concave downwards.
(d) graph of y(x) is concave upwards.
Give five of your favourite metrics on \mathbb{R^2}.
Show that C[0, 1] is a metric space with metric d_{\infty}(f,g):=||f-g||_{\infty}.
An open ball in a metric space (X, d) is given by
B_d(x,R):=\{ {y \in X:d(y,x)<R }\}
Let (X, d) be your favourite metric (X, d). How does open ball in (X, d) look like ?
Visualize the open ball B(f, R) in \left(C[0,1],d_{\infty}\right), where f is the identity function. We say that Y ⊆ X is open in X if for every y ∈ Y, there exists r > 0 such that B(y, r) ⊆ Y, that is,
{z ∈ X : d(z, y) < r} ⊆ Y.
Give five of your favourite open subsets of \mathbb{R^2} endowed with any of your favourite metrics.
Give five of your favourite non-open subsets of \mathbb{R^2} .
Let B[0, 1] denote the set of all bounded functions f:[0,1]\rightarrow \mathbb{R} endowed with the metric d_{\infty}. Show that C[0, 1] can not be open in B[0, 1].
Show that the open unit ball in (C[0,1],d_{\infty}) can not be open in (C[0, 1], d_1), where
d_1(f,g)=\int_{[0,1]}|f(t)-g(t)|dt.
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