Nullity

Nullity may refer to:

• Nullity (conflict), a legal declaration that no marriage had ever come into being
• Nullity, the dimension of the null space of a mathematical operator or matrix
• Nullity (graph theory), the nullity of the oriented incidence matrix of a graph
• Nullity, the difference between the size and rank of a subset in a matroid
• Nullity, a number in transreal arithmetic denoted by Φ