There are, in conclusion, at least two different types of memory matrices, and one can use them either separatedly or together. This makes it important to distinguish between the memory matrix method and the particular algorithms which are based on it, and in order to underline such a distinction it is convenient to adopt a new terminology.
The family of all algorithms which use memory matrices is referred to as MRM (Memory Reconstruction Method), whereas any individual member of this family is indicated with the label MRM followed by a number. More precisely, MRM-1 is the algorithm which employs only the vortex memory (Density Modulation), MRM-2 is using only the stationary points memory, and MRM-3 is the algorithm of formula (3-12) which exploits both memories.
At this point we are left with the problem of discovering yet more memory matrices, and here we have plenty of suggestions. It is plausible, for example, that a memory of boundaries, or more in general a memory of discontinuities, could be built, but we can leave these developments to the future. We have seen that the memory matrix method can indeed perform reconstructions from incomplete information, and we already have therefore what we were looking for: a model that may help us understanding the logic of embryonic development.

The two general principles of MRM

When we speak of mathematical models for biology, we usually refer to formulae (such as the Hardy-Weinberg theorem, or the Lotka-Volterra equations) that effectively describe some features of living systems.