The Chaz 2.0
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 49 True or false? $x^2\ne x\implies x\ne 1$ 39 Coffee Break Riddle 24 Proving $\sqrt 3$ is irrational. 20 Square Root Inequality 16 What's bad about calling $i$ “the square root of -1”?

### Reputation (7,311)

 +10 Square Root Inequality +10 Why is it possible to conclude everything from a false statement? +10 How would one calculate the cosine of an obtuse angle? +5 Identification of a quadrilateral as a trapezoid, rectangle, or square

### Questions (26)

 169 Identification of a quadrilateral as a trapezoid, rectangle, or square 19 Interpreting the Cayley-Hamilton theorem 16 Is there a rule of integration that corresponds to the quotient rule? 14 Proof of a formula involving Euler's totient function: $\varphi (mn) = \varphi (m) \varphi (n) \cdot \frac{d}{\varphi (d)}$ 13 Basis for $\mathbb{Z}^2$

### Tags (97)

 74 logic × 8 43 puzzle × 4 64 calculus × 32 39 trigonometry × 23 62 algebra-precalculus × 35 36 elementary-number-theory × 12 45 inequality × 7 28 proof-verification × 3 45 recreational-mathematics × 2 26 sequences-and-series × 5

### Accounts (14)

 Mathematics 7,311 rep 52259 Board & Card Games 1,791 rep 917 Music: Practice & Theory 473 rep 410 Physical Fitness 235 rep 16 Area 51 151 rep 2