Isaac
Reputation
26,471
84/100 score
8 70 122
Impact
~1.6m people reached

 110 Is $0.999999999\ldots = 1$? 87 Why $\sqrt{-1 \times {-1}} \neq \sqrt{-1}^2$? 74 Is there a general formula for solving 4th degree equations? 72 How to prove Euler's formula: $e^{it}=\cos t +i\sin t$? 56 Proof that the irrational numbers are uncountable

### Reputation (26,471)

 +20 Intuitive Understanding of the constant “$e$” +5 Probability that a stick randomly broken in two places can form a triangle +30 How to prove Euler's formula: $e^{it}=\cos t +i\sin t$? +10 Lines parallel to a given line

### Questions (20)

 44 Proving that 1- and 2-d simple symmetric random walks return to the origin with probability 1 38 Bad Fraction Reduction That Actually Works 24 Sum of the alternating harmonic series $\sum_{k=1}^{\infty}\frac{(-1)^{k+1}}{k} = \frac{1}{1} - \frac{1}{2} + \cdots$ 24 Probability that a stick randomly broken in two places can form a triangle 21 Useful examples of pathological functions

### Tags (151)

 598 algebra-precalculus × 128 182 complex-numbers × 11 521 geometry × 142 146 polynomials × 16 384 calculus × 72 146 fake-proofs × 4 294 trigonometry × 78 130 analytic-geometry × 45 186 euclidean-geometry × 44 116 arithmetic × 13

### Accounts (40)

 Mathematics 26,471 rep 870122 Stack Overflow 6,130 rep 42947 Area 51 1,811 rep 3215 Mathematica 1,399 rep 1429 Meta Stack Exchange 547 rep 1316