Wheatley extension replaces lower linear portion with quadratic
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Gradients
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Differences of two extensions vs original
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Expression 32: "m" left parenthesis, "x" , right parenthesis equals sgn left parenthesis, "x" , right parenthesis times "g" left parenthesis, abs left parenthesis, "x" , right parenthesis , right parenthesismx=sgnx·gabsx
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Expression 33: "m" Subscript, 2 , Baseline left parenthesis, "x" , right parenthesis equals sgn left parenthesis, "x" , right parenthesis times "g" Subscript, 2 , Baseline left parenthesis, abs left parenthesis, "x" , right parenthesis , right parenthesism2x=sgnx·g2absx
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Expression 34: "h" Subscript, 2 , Baseline left parenthesis, "x" , right parenthesis equals "f" left parenthesis, "x" , right parenthesis minus "m" Subscript, 2 , Baseline left parenthesis, "x" , right parenthesish2x=fx−m2x
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Expression 35: "h" left parenthesis, "x" , right parenthesis equals "f" left parenthesis, "x" , right parenthesis minus "m" left parenthesis, "x" , right parenthesishx=fx−mx