Questions asked by Andrew I.

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• What is the reverse gradient operation?
  
• How do you prove that the square root of a number #S# can be approximated by using the recurrence relation: #x_(n+1) = 1/2(x_n+S/x_n)# ?
  
• I have noticed a bug formatting equations and was wondering if someone could help?
  
• How do you prove: #lim_(x->0) sin(x)/x = 1# without using l'hopital's rule (or the derivative of sin(x) at all)?
  
• How to place a normalization coefficient at the start of a function with bra-ket notation?