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Minkowski Metric
Linked via "simultaneity"
Light-like (Null) Intervals ($ds^2 = 0$)
If $ds^2 = 0$, the interval is null, or light-like. This separation corresponds precisely to the path of massless particles, such as photons. The set of all points connected to an origin event by null intervals forms the light cone. The structure of the light cone is fundamentally related to the perception of simultaneity across different inertial frames.
Space-like Intervals ($ds^2 < 0$) -
Tiantai School
Linked via "simultaneity"
The Truth of the Middle Way (Chū/Madhyama Pratiipad): The Middle Way is not a compromise between Emptiness and Temporariness, but the simultaneous identity of the two. In Tiantai, this identity is understood as the "Vibrant Immanence," where the phenomenal reality (Temporariness) is the ultimate reality ([Emptiness](/entries/emptiness/…