The Cross Product Between Two Vectors Definition Let u = ai + bj + ck and v = di + ej + fk be vectors then we define the cross product v x w by the determinant of the matrix:
Huperzia serrata is a rare Chinese herb which contains a powerful alkaloid called Huperzine A (Hup A for short). According to studies, Hup A has been proven to be beneficial in protecting the brain, including slowing the progression of Alzheimer's disease.
The active ingredient which is extracted from Huperzia serrata is called huperzine A (or Hup A) . In China, this extract has been in use for centuries for a number of conditions, including fever, inflammation, and blood disorders; in the United States, it is available as a natural supplement to aid in memory support.