What perceptrons cannot learn
	• The adaptive part of a perceptron cannot even tell if two single bit features have the same value! Same:     (1,1)  1;  (0,0)  1 Different: (1,0)  0;  (0,1)  0 • The four feature-output pairs give four inequalities that are impossible to satisfy:
								Data Space
				0,1									1,1
													1,0
				0,0
			The positive and negative cases cannot be separated by a plane