R2-D2 (also known as Artoo), is an astromech droid and friend of C-3PO in the fictional Star Wars universe. R2-D2 was played by Kenny Baker in all five Star Wars films.

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... if {0} is a maximal ideal.
Uses
One use of prime ideals occurs in algebraic geometry, where varieties are defined as the zero sets of ideals in polynomial rings. I ...