Ibix
Science Advisor
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I think the Facebook user is adding confusion to this, yes. The hypotenuse has "length" zero, but non-zero projections on to both the horizontal and vertical axes.Arjan82 said:I don't get this
As Orodruin notes, the diagram is a Minkowski diagram, widely used in relativity as a "map" of a two dimensional spacetime (one time, one space dimension) using the old "imaginary time" approach.