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- Q105356164-3ae46806-47ed-8ef4-b8f9-ce1b275ddcb6 P2534 "<math xmlns="http://www.w3.org/1998/Math/MathML" display="block" alttext="{\displaystyle \operatorname {sgn} z={\begin{cases}{\frac {z}{\vert z\vert }}&z\neq 0\\0&z=0\end{cases}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>sgn</mi> <mo>⁡<!-- --></mo> <mi>z</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mrow> <mo>{</mo> <mtable columnalign="left left" rowspacing=".2em" columnspacing="1em" displaystyle="false"> <mtr> <mtd> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mi>z</mi> <mrow> <mo fence="false" stretchy="false">|</mo> <mi>z</mi> <mo fence="false" stretchy="false">|</mo> </mrow> </mfrac> </mrow> </mtd> <mtd> <mi>z</mi> <mo>≠<!-- ≠ --></mo> <mn>0</mn> </mtd> </mtr> <mtr> <mtd> <mn>0</mn> </mtd> <mtd> <mi>z</mi> <mo>=</mo> <mn>0</mn> </mtd> </mtr> </mtable> <mo fence="true" stretchy="true" symmetric="true"></mo> </mrow> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \operatorname {sgn} z={\begin{cases}{\frac {z}{\vert z\vert }}&z\neq 0\\0&z=0\end{cases}}}</annotation> </semantics> </math>" @default.