About: Proof that φ is irrational   Sponge Permalink

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φ (phi) is the number such that is the positive solution to the equation (defined implicitly) A proof of its irrationality: 1. * (given) 2. * (subtract phi and 1 from both sides) 3. * (Quadratic formula) 4. * (Simplify) 5. * (Positive root only) 6. * (Separate fractions) 7. * Since the square root of 5 is irrational, and an irrational number divided by a rational number is an irrational number, and an irrational number plus a rational number is an irrational number, φ is irrational.

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  • Proof that φ is irrational
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  • φ (phi) is the number such that is the positive solution to the equation (defined implicitly) A proof of its irrationality: 1. * (given) 2. * (subtract phi and 1 from both sides) 3. * (Quadratic formula) 4. * (Simplify) 5. * (Positive root only) 6. * (Separate fractions) 7. * Since the square root of 5 is irrational, and an irrational number divided by a rational number is an irrational number, and an irrational number plus a rational number is an irrational number, φ is irrational.
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abstract
  • φ (phi) is the number such that is the positive solution to the equation (defined implicitly) A proof of its irrationality: 1. * (given) 2. * (subtract phi and 1 from both sides) 3. * (Quadratic formula) 4. * (Simplify) 5. * (Positive root only) 6. * (Separate fractions) 7. * Since the square root of 5 is irrational, and an irrational number divided by a rational number is an irrational number, and an irrational number plus a rational number is an irrational number, φ is irrational.
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