A dyad is the Outer Product of two Vectors.
A dyad is a quantity that has a magnitude and two associated directions.
Appendix A
The sum of two tensors is the sum of the corresponding dyads.
Appendix B
The sum of two dyadics is the dyadic obtained by adding the corresponding elements of the two dyadics.
Appendix C
The dot product of a dyadic and a vector is a vector.
Vectoreverything 