Definition of Boundary Points
50150
Precise definition of the boundary set
46869
Define a coordinate on a circle
88616
Retraction of the Möbius strip to its boundary
100707
Where does that border come from?
61446
Fixed point of interior of closed disk
64523
interior points and limit points of $\{(x,y): x^2+2y^2 < 1\}$
69103
$\limsup$ and cluster points
56728
Question about limit points of a Subset of $\mathbb{R}$
42088
Is there a rigorous definition of a line?
41997
Can the boundary of a set be ignored, when integrating over it.
56035
Points on polygon perimeter ArcGIS
69235
padded boundary of convex hull
135025
Axiomatization of a Topology using the Boundary
53132
A convex subset of a set has 'smaller' boundary than the set?
30081
Administrative boundaries worldwide
26690
Where do 'line and point' holes come from?
13658
Distinction between vectors and points