- boundary of a simplex
- boundary of a strip
- boundary of a surface
- boundary of a topological manifold
- boundary of a topological space
- boundary of convexity
- boundary of firm
- boundary of the systems
- boundary operation
- boundary operator
- boundary parallel surface
- boundary phase
- boundary pillars in scenic and historic area
- boundary plane
- boundary point
- boundary point lemma
- boundary problem
- boundary property
- boundary property of analytic function
- boundary reduction
- boundary refraction
- boundary regularity
- boundary relation
- boundary representation
- boundary river navigation