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{{quotation|''One finds that time just disappears from the [[Wheeler-deWitt equation]], it is an issue that many theorists have puzzled about. It may be that th

...the equation t2 − x2 − y2 = 0, or t2 = x2 + y2. The points that solve this equation form a double cone whose apex is at the origin. According to relativity, th This is the equation of a hyperboloid of revolution that asymptotically approaches the light-con