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   Cell[BoxData[RowBox[List[RowBox[List[SubscriptBox["\[PartialD]", "z"], RowBox[List["Round", "[", "z", "]"]]]], "\[Equal]", "0"]]]] 
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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>  <mfrac>  <mrow>  <mo> ∂ </mo>  <mrow>  <mo> ⌊ </mo>  <mi> z </mi>  <mo> ⌉ </mo>  </mrow>  </mrow>  <mrow>  <mo> ∂ </mo>  <mi> z </mi>  </mrow>  </mfrac>  <mo> ⩵ </mo>  <mn> 0 </mn>  </mrow>  <annotation-xml encoding='MathML-Content'>  <mrow>  <mfrac>  <mrow>  <mo> ∂ </mo>  <mrow>  <mo> ⌊ </mo>  <mi> z </mi>  <mo> ⌉ </mo>  </mrow>  </mrow>  <mrow>  <mo> ∂ </mo>  <mi> z </mi>  </mrow>  </mfrac>  <mo> ⩵ </mo>  <mn> 0 </mn>  </mrow>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List[SubscriptBox["\[PartialD]", RowBox[List["z_"]]], RowBox[List["Round", "[", "z_", "]"]]]], "]"]], "\[RuleDelayed]", "0"]]]]  |  
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