Matrix pencil
In linear algebra, a matrix pencil is a matrix-valued function defined on a field K {\displaystyle K} , usually the real or complex numbers. == Definition == Let K {\displaystyle K} be a field (typically, K ∈ { R , C } {\displaystyle K\in \{\mathbb {R} ,\mathbb {C} \}} ; the definition can be generalized to rngs, i.e.