Fallacies in Mathematics

6 comments

  1. Here the error is in the application of the property: √(a×b) = √(a) × √(b), which is valid if a≥0 and b≥0. Therefore, the equality √[(-1)×(-1)] = √(-1) × √(-1) is an error.

  2. 2: Relies on incorrectly not specifying which root signs are valid, like 1 = sqrt(1^2) = sqrt(1) = -1

    3: Same as 2

    4: Divides by 0

    5: Same as 4

    6: When we say inf+x = x, the equality is referring to effects on multiplication and converging sequences/integration, not further addition

    7: sin(x) is an oscillating function, so its inverse is infinitely multivariate unless the range is restricted, as is clear from the graph shape

    8: Same as 7 but only 1 oscillation

    9: The assumption of correlated inequality only applies if they are all positive integers, since with negatives the ratios are 1/-1 = -1/1

    10: Constant +c wasn’t included in any of the indefinite integrals

    11: logs of negative numbers are undefined

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