Functions

[hlreed]

A function is a mapping of inputs to an output.
Functions are machines that read inputs and write an output. A = f(x,y) shows how functions are written. A function says, "We know A does something on some data, but we don't know what yet." To make a function explicit you define the actions and data like this: f(x,y) = x - y
Now when you see f(x,y) it means x - y
Functions can be any size, measured by the number of inputs. f(x,y) is two dimensions if you wish.
f(x,y,z) is three dimensions. f(w,x,y,z) is four.
How this connects to robots is that neurons are functions. Axon = N(S) where S is all the synapses. Neurons are, like functions, of any size measured by the number of synapses. There is no way to build an N input neuron. However we can build a two input neuron that we can characterize and build N input trees with those.
This is step 1 in learning Hal algebra.