Simple mathematical concepts such as counting appear to be firmly anchored in the natural process of thinking. Studies have shown that even very young children and animals possess such skills to a ...

All of modern mathematics is built on the foundation of set theory, the study of how to organize abstract collections of objects. But in general, research mathematicians don’t need to think about it ...

The 2-domination number γ₂(G) of a graph G is the minimum cardinality of a set S ⊆ V(G) such that every vertex from V(G) \ S is adjacent to at least two vertices in S. The annihilation number a(G) is ...