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A language LCK is said to be ciosed relative to K, or simply K-closed, if L = InK. (a) Show that if L; is
A language LCK is said to be ciosed relative to K, or simply K-closed, if L = InK. (a) Show that if L; is K-closed for i = 1,2 then so is Lin L2. (b) Show that if La La and we define Lam LanK, then Lam is K-closed. %3D
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A First Course in General Relativity
Authors: Bernard Schutz
2nd edition
521887054, 978-0521887052
