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   http://functions.wolfram.com/12.01.29.0008.01
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    Abs[Sum[Subscript[z, k], {k, 1, n}]] <= Sum[Abs[Subscript[z, k]], {k, 1, n}] 
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   Cell[BoxData[RowBox[List[RowBox[List["Abs", "[", RowBox[List[UnderoverscriptBox["\[Sum]", RowBox[List["k", "=", "1"]], "n"], SubscriptBox["z", "k"]]], "]"]], "\[LessEqual]", RowBox[List[UnderoverscriptBox["\[Sum]", RowBox[List["k", "=", "1"]], "n"], RowBox[List["Abs", "[", SubscriptBox["z", "k"], "]"]]]]]]]] 
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   <math xmlns='http://www.w3.org/1998/Math/MathML' mathematica:form='TraditionalForm' xmlns:mathematica='http://www.wolfram.com/XML/'>  <semantics>  <mrow>  <mrow>  <semantics>  <mo> ❘ </mo>  <annotation encoding='Mathematica'> "\[LeftBracketingBar]" </annotation>  </semantics>  <mrow>  <munderover>  <mo> ∑ </mo>  <mrow>  <mi> k </mi>  <mo> = </mo>  <mn> 1 </mn>  </mrow>  <mi> n </mi>  </munderover>  <msub>  <mi> z </mi>  <mi> k </mi>  </msub>  </mrow>  <semantics>  <mo> ❘ </mo>  <annotation encoding='Mathematica'> "\[RightBracketingBar]" </annotation>  </semantics>  </mrow>  <mo> ≤ </mo>  <mrow>  <munderover>  <mo> ∑ </mo>  <mrow>  <mi> k </mi>  <mo> = </mo>  <mn> 1 </mn>  </mrow>  <mi> n </mi>  </munderover>  <mrow>  <semantics>  <mo> ❘ </mo>  <annotation encoding='Mathematica'> "\[LeftBracketingBar]" </annotation>  </semantics>  <msub>  <mi> z </mi>  <mi> k </mi>  </msub>  <semantics>  <mo> ❘ </mo>  <annotation encoding='Mathematica'> "\[RightBracketingBar]" </annotation>  </semantics>  </mrow>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <leq />  <apply>  <abs />  <apply>  <sum />  <bvar>  <ci> k </ci>  </bvar>  <lowlimit>  <cn type='integer'> 1 </cn>  </lowlimit>  <uplimit>  <ci> n </ci>  </uplimit>  <apply>  <ci> Subscript </ci>  <ci> z </ci>  <ci> k </ci>  </apply>  </apply>  </apply>  <apply>  <sum />  <bvar>  <ci> k </ci>  </bvar>  <lowlimit>  <cn type='integer'> 1 </cn>  </lowlimit>  <uplimit>  <ci> n </ci>  </uplimit>  <apply>  <abs />  <apply>  <ci> Subscript </ci>  <ci> z </ci>  <ci> k </ci>  </apply>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["Abs", "[", RowBox[List[UnderoverscriptBox["\[Sum]", RowBox[List["k", "=", "1"]], "n"], SubscriptBox["z", "k"]]], "]"]], "\[LessEqual]", RowBox[List[UnderoverscriptBox["\[Sum]", RowBox[List["k", "=", "1"]], "n"], RowBox[List["Abs", "[", SubscriptBox["z", "k"], "]"]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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