This paper establishes some new equalities and inequalities for the null and column spaces of combinations of two projectors P and Q. Some new necessary and suf
Let K be a finite field of characteristic ≠ 2 and G the additive group of K × K. Let k1, k2 be integers not divisible by the characteristic p of K with(k1,
We give the definition of G-inner action of two semilattice graded weak Hopf algebras with the same semilattice Y, and the necessary and sufficient conditions f