99 Do "other" trigonometric functions than Tan Sin Cos and their derivatives exist? 62 Why do we miss 8 in the decimal expansion of 1/81, and 98 in the decimal expansion of 1/9801? 31 Set builder notation: Colon or Vertical Line 28 Is it bad to resort to numerical examples to understand the idea behind a proof? 18 When you inscribe a triangle in a circle in a triangle in a circle in a triangle ...

### Reputation (17,698)

 +10 What are the sine and cosine of dyadic angles? -2 How do you find Pythagorean triples that approximately correspond to a right triangle with a given angle? +10 Information about the total complex from the second page of a spectral sequence +10 Set builder notation: Colon or Vertical Line

### Questions (104)

 63 Graphs for which a calculus student can reasonably compute the arclength 36 When you inscribe a triangle in a circle in a triangle in a circle in a triangle ... 31 How do you find Pythagorean triples that approximately correspond to a right triangle with a given angle? 27 Why worry about commutativity but not associativity in The Fundamental Theorem of Arithmetic? 16 "Drawable" Examples of Vector Bundles

### Tags (282)

 154 graph-theory × 101 70 elementary-set-theory × 22 137 algebra-precalculus × 64 62 decimal-expansion 105 abstract-algebra × 82 61 notation × 22 83 discrete-mathematics × 29 60 group-theory × 35 71 fractions × 7 57 calculus × 33

### Bookmarks (130)

 585 Examples of patterns that eventually fail 393 The Ring Game on $K[x,y,z]$ 382 Pedagogy: How to cure students of the "law of universal linearity"? 295 One question to know if the number is 1, 2 or 3 230 What are some counter-intuitive results in mathematics that involve only finite objects?