Minimum dimension to embed a graph with no crossings
121402
Planar Realization of a Graph in Three-Space
65639
Existence of a self-complementary graph
158202
Minimum dimension to hold $N$ points with given distances?
84654
The graph of xy = 1 is connected or not
59247
How many connected graphs over V vertices and E edges?
123656
Covering map between orientable compact connected surfaces without boundary with genus $g$
146016
no cycles if and only if has $n-m$ connected components
145194
Matrix graph and irreducibility
116932
Proving a simple graph is a connected graph
81928
Covering with most possible equal size subsets having pairwise singleton intersections
18117
Maximum number of edges in a simple graph?
33822
Is there a monoid structure on the set of paths of a graph?
14429
dimension of a subspace spanned by two subspaces
47730
graph is dense in $\mathbb{R}^2$
152236
What is the optimal path between $2$ fixed points around an invisible obstructing wall?
33188
Dimension of null space of a given problem
88206
Image of a line in $\mathbb{P}^2$ under Veronese embedding