Invariance of domain for smooth functions
71479
Is there some elementary proof of invariance of domain?
65509
Several Questions on Smooth Urysohn's Lemma
103550
Multiplicative Euclidean Function for an Euclidean Domain
135863
Is the graph of a continuous function homeomorphic to its domain?
153191
A function satisfy $x\frac{\partial f(x,y)}{\partial x}+y\frac{\partial f(x,y)}{\partial y}=0$ in a convex domain implies it is a constant
7945
Approximate $|x|$ with a smooth function
110219
Bound on the derivative of a holomorphic function at $0$
128410
Showing that the set of fixed points is a smooth manifold
46504
Does there exist a smooth approximation of $x \bmod y$?
6417
Can a function be differentiable at the end points of its (closed interval) domain?
62971
About smooth approximation in a Sobolev space
130180
Smooth function with all derivatives zero
85157
Does a smooth "transition function" with bounded derivatives exist?
67791
Can I exchange limit and differentiation for a sequence of smooth functions?
98800
Do local flows of left-invariant vector fields satisfy $\Phi_X^t\circ L_x=L_x\circ \Phi_X^t$?
37303
Differential of a smooth function
139419
Problem on the domain of the solution of a differential equation