Premise: Leading north from the Piazza del Duomo, the huge croseshaped shopping arcade of the Galleria Vittorio Emanuele is a splendid steel and glass monument to the expansive commercial spirit of the 19th century, and a prototype of today's shopping mall.

Hypothesis: The Galleria Vittorio Emanuele is nowhere near the Piazza del Duomo. 
Relation: contradiction