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+Sources of error
+  Higher precision=higher accuracy for numerical approximation of analytical model
+  Truncation (approx of function), roundoff error (fixed number of bits)
+  
+  Roundoff error:
+  11011 in base 2 = 2^4+2^3+0*2^2+2^1+2^0=27
+  1.011=2^0+0*2^-1+2^-2+2^-3=1.375
+  Max 8 bit integer: 2^8
+  
+Trunction error:
+  Taylor series
+  
+Root finding:
+  Bracketing: incremental
+  Open: newton raphson,  modified secant
+  
+Optimization
+  if derivative is know, min max of f(x)
+  Golden ratio