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  1. S

    Math

    How much time do mathematicians spend on memorizing axioms, definitions, theorems, lemmas ect... ? Do they spend more time on learning the precise definition of a theory than doing computations and learning algorithms? I'm curious to know...
  2. S

    epsilon-delta limit definition

    Ok, can someone explain to me how this definition guarantees the existence of the limit or what is the point of the definition. After many attempts to understand it, im still as confused as ever. :mad:
  3. S

    probability questions

    I know the first way (the ordered way) is correct, but why? Can someone explain this to me please. And can someone derive for me or explain to me with logics the formula: <sup>(n+r-1)</sup>C<sub>r</sub> for unordered selection with replacement.
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