Hello every one i have question what is the unit vector of time component like c^2 t^2 -x^2-y^2-z^2 = 0(adsbygoogle = window.adsbygoogle || []).push({});

OR

if we need to calculate the d'alembert cross some 4 vector have 3 space component x y z and unit vector i j k

and ct component what is the unit vector in Ct direction ???

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# Time unit vector

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