Theorem (Hurwitz, 1891). Let z be irational. Then there are in finitely many distinct rational numbers for which Proof. This needs more advanced number theory. (But proving that this inequality is strict, i.e., that 5 cannot be increased, would be hard but feasible.)

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Theorem (Hurwitz, 1891). Let z be irrational. Then there are in finitely many distinct rat ional numbers 2
for which
Proof. This needs more advanced number theory. (But proving that this inequality is strict, i.e., that 5
cannot be increased, would be hard but fea si ble.)
Transcribed Image Text:Theorem (Hurwitz, 1891). Let z be irrational. Then there are in finitely many distinct rat ional numbers 2 for which Proof. This needs more advanced number theory. (But proving that this inequality is strict, i.e., that 5 cannot be increased, would be hard but fea si ble.)
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