XOR problem

Page numbers are for draft copy at present; they will be replaced with correct numbers when final book is formatted. Chapter numbers are correct and will not change now.

Early single-layer perceptrons were not able to solve the XOR problem, that is how to calculate the exclusive or of two inputs.

Defined on page 112

Used on Chap. 6: pages 112, 114, 126

Also known as exclusive or problem