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1. Let a, b, c E R and let Sabe = ((x, y, z) : ax2 + by2 + cz2 = 0, x2+ y2 +22

1. Let a, b, c E R and let Sabe = ((x, y, z) : ax2 + by2 + cz2 = 0, x2+ y2 +22 = 1}. (1c) For which values a, b, c is Sabe discrete? (A set S C IR" is discrete if for each x E S, there exists & > 0 such that Be(x) nS = (x}.)

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