Their problem was that both the membrane current l M and the membrane potential V M are also changing constantly during the action potential. Now if one of these variables could be held constant during the action potential (i.e., V M), measurement of l M would enable them to calculate g M at any instant.
The CMMi Easy button notes on Product Integration (PI) Process Area Product Integration (PI) is one of the core Engineering Process Areas within CMMi, this process is concerned with assembly of product components to build the finished software product.
cross product, vector product - a vector that is the product of two other vectors vector sum, resultant - a vector that is the sum of two or more other vectors radius vector - a line connecting a point in space to the origin of a polar coordinate system radius vector - a line connecting a satellite to the center of the body around which it is rotating