Play Station 1
Po matematici, razlika između Play Stationa 3 i Play Stationa 2.
Δ Play Station (3,2) = Play Stationa 3 - Play Stationa 2 = Play Station (3-2) = Play Station 1
+4 -4 = 0
Komentari
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*ispravka Fenderove definicije koja nije matematicki korektna.