Differences of squares is what u see in relativity theory......

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Albert Einstein, in his theory of special relativity, determined that the laws of physics are the same for all non-accelerating observers, and he showed that the speed of light within a vacuum is the same no matter the speed at which an observer travels.Jul 12, 2016

Einstein's Theory of General Relativity: A Simplified Explanation

https://www.space.com/17661-theory-general-relativity.html

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Theory of relativity - Wikipedia

https://en.wikipedia.org/wiki/Theory_of_relativity

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Special relativity is a theory of the structure of spacetime. ... The laws of physics are the same for all observers in uniform motion relative to one another (principle of relativity). The speed of light in a vacuum is the same for all observers, regardless of their relative motion or of the motion of the light source.

‎Principle of relativity · ‎Relativity of simultaneity · ‎The Einstein Theory of Relativity

Einstein's Theory of General Relativity: A Simplified Explanation

https://www.space.com › Science & Astronomy

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Jul 12, 2016 - Albert Einstein, in his theory of special relativity, determined that the laws of physics are the same for all non-accelerating observers, and he showed that the speed of light within a vacuum is the same no matter the speed at which an observer travels.