Search for question
Question

7. The center of D4 is defined by Z(D4) = {0 E D4|0OT = Too for all T E D4}. For

example, we have & E Z(D4) because & O T = Toe for all T E D4.

be

Note: The notation Z(D4) originates from the German word Zentrum ("center").

Fig: 1