In essence: x = xyy and y = yzz symbolize the cyclic equivalence among the three −1 (spatial) directions, which is only possible because time gets the lone +1 (or vice versa). This repetition/cycling is forbidden to include time without breaking Lorentz invariance or causality. It's a mathematical fingerprint of why time feels so different—its sign singles it out, while space's three dimensions share uniform treatment, allowing these neat cyclic shorthands.

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