An mo element represents an operator or anything that should be rendered as an operator. In MathML the list of things that should "render as an operator" includes a number of notations that are not mathematical operators in the ordinary sense. Besides ordinary operators with infix, prefix, or postfix forms, these include fence characters such as braces, parentheses, and "absolute value" bars; separators such as comma and semicolon; and mathematical accents such as a bar or tilde over a symbol. MathML Fundamentals
<math mathsize="28"> <mspace linebreak="newline" indentalign="center"></mspace> <mtext style="border:1px;" mathsize="40">Operators - arrows</mtext> <mspace linebreak="newline" indentalign="center"></mspace> <mfrac style="border:1px"> <mtext>221A</mtext> <mrow> <mo style="border:1px">√</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >√</mo> <mo style="border:1px" minsize="2" maxsize="2">√</mo> <mo style="border:1px" minsize="5">√</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>2044</mtext> <mrow> <mo style="border:1px">⁄</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⁄</mo> <mo style="border:1px" minsize="2" maxsize="2">⁄</mo> <mo style="border:1px" minsize="5">⁄</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>2191</mtext> <mrow> <mo style="border:1px">↑</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↑</mo> <mo style="border:1px" minsize="2" maxsize="2">↑</mo> <mo style="border:1px" minsize="5">↑</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>2193</mtext> <mrow> <mo style="border:1px">↓</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↓</mo> <mo style="border:1px" minsize="2" maxsize="2">↓</mo> <mo style="border:1px" minsize="5">↓</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>2195</mtext> <mrow> <mo style="border:1px">↕</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↕</mo> <mo style="border:1px" minsize="2" maxsize="2">↕</mo> <mo style="border:1px" minsize="5">↕</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>219F</mtext> <mrow> <mo style="border:1px">↟</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↟</mo> <mo style="border:1px" minsize="2" maxsize="2">↟</mo> <mo style="border:1px" minsize="5">↟</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21A1</mtext> <mrow> <mo style="border:1px">↡</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↡</mo> <mo style="border:1px" minsize="2" maxsize="2">↡</mo> <mo style="border:1px" minsize="5">↡</mo> </mrow> </mfrac> <mspace linebreak="newline" indentalign="center"></mspace> <mfrac style="border:1px"> <mtext>2190</mtext> <mrow> <mo style="border:1px">←</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >←</mo> <mo style="border:1px" minsize="2" maxsize="2">←</mo> <mo style="border:1px" minsize="5">←</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>2192</mtext> <mrow> <mo style="border:1px">→</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >→</mo> <mo style="border:1px" minsize="2" maxsize="2">→</mo> <mo style="border:1px" minsize="5">→</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>2194</mtext> <mrow> <mo style="border:1px">↔</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↔</mo> <mo style="border:1px" minsize="2" maxsize="2">↔</mo> <mo style="border:1px" minsize="5">↔</mo> </mrow> </mfrac> <mspace linebreak="newline" indentalign="center"></mspace> <mfrac style="border:1px"> <mtext>219E</mtext> <mrow> <mo style="border:1px">↞</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↞</mo> <mo style="border:1px" minsize="2" maxsize="2">↞</mo> <mo style="border:1px" minsize="5">↞</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21A0</mtext> <mrow> <mo style="border:1px">↠</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↠</mo> <mo style="border:1px" minsize="2" maxsize="2">↠</mo> <mo style="border:1px" minsize="5">↠</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21A2</mtext> <mrow> <mo style="border:1px">↢</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↢</mo> <mo style="border:1px" minsize="2" maxsize="2">↢</mo> <mo style="border:1px" minsize="5">↢</mo> </mrow> </mfrac> <mspace linebreak="newline" indentalign="center"></mspace> <mfrac style="border:1px"> <mtext>21A3</mtext> <mrow> <mo style="border:1px">↣</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↣</mo> <mo style="border:1px" minsize="2" maxsize="2">↣</mo> <mo style="border:1px" minsize="5">↣</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21A4</mtext> <mrow> <mo style="border:1px">↤</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↤</mo> <mo style="border:1px" minsize="2" maxsize="2">↤</mo> <mo style="border:1px" minsize="5">↤</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21A6</mtext> <mrow> <mo style="border:1px">↦</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↦</mo> <mo style="border:1px" minsize="2" maxsize="2">↦</mo> <mo style="border:1px" minsize="5">↦</mo> </mrow> </mfrac> <mspace linebreak="newline" indentalign="center"></mspace> <mfrac style="border:1px"> <mtext>21A9</mtext> <mrow> <mo style="border:1px">↩</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↩</mo> <mo style="border:1px" minsize="2" maxsize="2">↩</mo> <mo style="border:1px" minsize="5">↩</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21AA</mtext> <mrow> <mo style="border:1px">↪</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↪</mo> <mo style="border:1px" minsize="2" maxsize="2">↪</mo> <mo style="border:1px" minsize="5">↪</mo> </mrow> </mfrac> <mspace linebreak="newline" indentalign="center"></mspace> <mfrac style="border:1px"> <mtext>21AB</mtext> <mrow> <mo style="border:1px">↫</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↫</mo> <mo style="border:1px" minsize="2" maxsize="2">↫</mo> <mo style="border:1px" minsize="5">↫</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21AC</mtext> <mrow> <mo style="border:1px">↬</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↬</mo> <mo style="border:1px" minsize="2" maxsize="2">↬</mo> <mo style="border:1px" minsize="5">↬</mo> </mrow> </mfrac> <mspace linebreak="newline" indentalign="center"></mspace> <mfrac style="border:1px"> <mtext>21A5</mtext> <mrow> <mo style="border:1px">↥</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↥</mo> <mo style="border:1px" minsize="2" maxsize="2">↥</mo> <mo style="border:1px" minsize="5">↥</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21A7</mtext> <mrow> <mo style="border:1px">↧</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↧</mo> <mo style="border:1px" minsize="2" maxsize="2">↧</mo> <mo style="border:1px" minsize="5">↧</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21A8</mtext> <mrow> <mo style="border:1px">↨</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↨</mo> <mo style="border:1px" minsize="2" maxsize="2">↨</mo> <mo style="border:1px" minsize="5">↨</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21B0</mtext> <mrow> <mo style="border:1px">↰</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↰</mo> <mo style="border:1px" minsize="2" maxsize="2">↰</mo> <mo style="border:1px" minsize="5">↰</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21B1</mtext> <mrow> <mo style="border:1px">↱</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↱</mo> <mo style="border:1px" minsize="2" maxsize="2">↱</mo> <mo style="border:1px" minsize="5">↱</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21B2</mtext> <mrow> <mo style="border:1px">↲</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↲</mo> <mo style="border:1px" minsize="2" maxsize="2">↲</mo> <mo style="border:1px" minsize="5">↲</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21B3</mtext> <mrow> <mo style="border:1px">↳</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↳</mo> <mo style="border:1px" minsize="2" maxsize="2">↳</mo> <mo style="border:1px" minsize="5">↳</mo> </mrow> </mfrac> <mspace linebreak="newline" indentalign="center"></mspace> <mfrac style="border:1px"> <mtext>21B4</mtext> <mrow> <mo style="border:1px">↴</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↴</mo> <mo style="border:1px" minsize="2" maxsize="2">↴</mo> <mo style="border:1px" minsize="5">↴</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21B5</mtext> <mrow> <mo style="border:1px">↵</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↵</mo> <mo style="border:1px" minsize="2" maxsize="2">↵</mo> <mo style="border:1px" minsize="5">↵</mo> </mrow> </mfrac> <mspace linebreak="newline" indentalign="center"></mspace> <mfrac style="border:1px"> <mtext>21B9</mtext> <mrow> <mo style="border:1px">↹</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↹</mo> <mo style="border:1px" minsize="2" maxsize="2">↹</mo> <mo style="border:1px" minsize="5">↹</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21C4</mtext> <mrow> <mo style="border:1px">⇄</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇄</mo> <mo style="border:1px" minsize="2" maxsize="2">⇄</mo> <mo style="border:1px" minsize="5">⇄</mo> </mrow> </mfrac> <mspace linebreak="newline" indentalign="center"></mspace> <mfrac style="border:1px"> <mtext>21BC</mtext> <mrow> <mo style="border:1px">↼</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↼</mo> <mo style="border:1px" minsize="2" maxsize="2">↼</mo> <mo style="border:1px" minsize="5">↼</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21BD</mtext> <mrow> <mo style="border:1px">↽</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↽</mo> <mo style="border:1px" minsize="2" maxsize="2">↽</mo> <mo style="border:1px" minsize="5">↽</mo> </mrow> </mfrac> <mspace linebreak="newline" indentalign="center"></mspace> <mfrac style="border:1px"> <mtext>21BE</mtext> <mrow> <mo style="border:1px">↾</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↾</mo> <mo style="border:1px" minsize="2" maxsize="2">↾</mo> <mo style="border:1px" minsize="5">↾</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21BF</mtext> <mrow> <mo style="border:1px">↿</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >↿</mo> <mo style="border:1px" minsize="2" maxsize="2">↿</mo> <mo style="border:1px" minsize="5">↿</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21C2</mtext> <mrow> <mo style="border:1px">⇂</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇂</mo> <mo style="border:1px" minsize="2" maxsize="2">⇂</mo> <mo style="border:1px" minsize="5">⇂</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21C3</mtext> <mrow> <mo style="border:1px">⇃</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇃</mo> <mo style="border:1px" minsize="2" maxsize="2">⇃</mo> <mo style="border:1px" minsize="5">⇃</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21C5</mtext> <mrow> <mo style="border:1px">⇅</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇅</mo> <mo style="border:1px" minsize="2" maxsize="2">⇅</mo> <mo style="border:1px" minsize="5">⇅</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21C8</mtext> <mrow> <mo style="border:1px">⇈</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇈</mo> <mo style="border:1px" minsize="2" maxsize="2">⇈</mo> <mo style="border:1px" minsize="5">⇈</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21CA</mtext> <mrow> <mo style="border:1px">⇊</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇊</mo> <mo style="border:1px" minsize="2" maxsize="2">⇊</mo> <mo style="border:1px" minsize="5">⇊</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21D1</mtext> <mrow> <mo style="border:1px">⇑</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇑</mo> <mo style="border:1px" minsize="2" maxsize="2">⇑</mo> <mo style="border:1px" minsize="5">⇑</mo> </mrow> </mfrac> <mspace linebreak="newline" indentalign="center"></mspace> <mfrac style="border:1px"> <mtext>21C0</mtext> <mrow> <mo style="border:1px">⇀</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇀</mo> <mo style="border:1px" minsize="2" maxsize="2">⇀</mo> <mo style="border:1px" minsize="5">⇀</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21C1</mtext> <mrow> <mo style="border:1px">⇁</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇁</mo> <mo style="border:1px" minsize="2" maxsize="2">⇁</mo> <mo style="border:1px" minsize="5">⇁</mo> </mrow> </mfrac> <mspace linebreak="newline" indentalign="center"></mspace> <mfrac style="border:1px"> <mtext>21C6</mtext> <mrow> <mo style="border:1px">⇆</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇆</mo> <mo style="border:1px" minsize="2" maxsize="2">⇆</mo> <mo style="border:1px" minsize="5">⇆</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21C7</mtext> <mrow> <mo style="border:1px">⇇</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇇</mo> <mo style="border:1px" minsize="2" maxsize="2">⇇</mo> <mo style="border:1px" minsize="5">⇇</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21C9</mtext> <mrow> <mo style="border:1px">⇉</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇉</mo> <mo style="border:1px" minsize="2" maxsize="2">⇉</mo> <mo style="border:1px" minsize="5">⇉</mo> </mrow> </mfrac> <mspace linebreak="newline" indentalign="center"></mspace> <mfrac style="border:1px"> <mtext>21CB</mtext> <mrow> <mo style="border:1px">⇋</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇋</mo> <mo style="border:1px" minsize="2" maxsize="2">⇋</mo> <mo style="border:1px" minsize="5">⇋</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21CC</mtext> <mrow> <mo style="border:1px">⇌</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇌</mo> <mo style="border:1px" minsize="2" maxsize="2">⇌</mo> <mo style="border:1px" minsize="5">⇌</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21D0</mtext> <mrow> <mo style="border:1px">⇐</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇐</mo> <mo style="border:1px" minsize="2" maxsize="2">⇐</mo> <mo style="border:1px" minsize="5">⇐</mo> </mrow> </mfrac> <mspace linebreak="newline" indentalign="center"></mspace> <mfrac style="border:1px"> <mtext>21D2</mtext> <mrow> <mo style="border:1px">⇒</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇒</mo> <mo style="border:1px" minsize="2" maxsize="2">⇒</mo> <mo style="border:1px" minsize="5">⇒</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21D4</mtext> <mrow> <mo style="border:1px">⇔</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇔</mo> <mo style="border:1px" minsize="2" maxsize="2">⇔</mo> <mo style="border:1px" minsize="5">⇔</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21DA</mtext> <mrow> <mo style="border:1px">⇚</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇚</mo> <mo style="border:1px" minsize="2" maxsize="2">⇚</mo> <mo style="border:1px" minsize="5">⇚</mo> </mrow> </mfrac> <mspace linebreak="newline" indentalign="center"></mspace> <mfrac style="border:1px"> <mtext>21D3</mtext> <mrow> <mo style="border:1px">⇓</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇓</mo> <mo style="border:1px" minsize="2" maxsize="2">⇓</mo> <mo style="border:1px" minsize="5">⇓</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21D5</mtext> <mrow> <mo style="border:1px">⇕</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇕</mo> <mo style="border:1px" minsize="2" maxsize="2">⇕</mo> <mo style="border:1px" minsize="5">⇕</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21E7</mtext> <mrow> <mo style="border:1px">⇧</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇧</mo> <mo style="border:1px" minsize="2" maxsize="2">⇧</mo> <mo style="border:1px" minsize="5">⇧</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21E9</mtext> <mrow> <mo style="border:1px">⇩</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇩</mo> <mo style="border:1px" minsize="2" maxsize="2">⇩</mo> <mo style="border:1px" minsize="5">⇩</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21EA</mtext> <mrow> <mo style="border:1px">⇪</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇪</mo> <mo style="border:1px" minsize="2" maxsize="2">⇪</mo> <mo style="border:1px" minsize="5">⇪</mo> </mrow> </mfrac> <mspace linebreak="newline" indentalign="center"></mspace> <mfrac style="border:1px"> <mtext>21DB</mtext> <mrow> <mo style="border:1px">⇛</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇛</mo> <mo style="border:1px" minsize="2" maxsize="2">⇛</mo> <mo style="border:1px" minsize="5">⇛</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21E4</mtext> <mrow> <mo style="border:1px">⇤</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇤</mo> <mo style="border:1px" minsize="2" maxsize="2">⇤</mo> <mo style="border:1px" minsize="5">⇤</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21E5</mtext> <mrow> <mo style="border:1px">⇥</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇥</mo> <mo style="border:1px" minsize="2" maxsize="2">⇥</mo> <mo style="border:1px" minsize="5">⇥</mo> </mrow> </mfrac> <mspace linebreak="newline" indentalign="center"></mspace> <mfrac style="border:1px"> <mtext>21E6</mtext> <mrow> <mo style="border:1px">⇦</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇦</mo> <mo style="border:1px" minsize="2" maxsize="2">⇦</mo> <mo style="border:1px" minsize="5">⇦</mo> </mrow> </mfrac> <mspace linebreak="newline" indentalign="center"></mspace> <mfrac style="border:1px"> <mtext>21E8</mtext> <mrow> <mo style="border:1px">⇨</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇨</mo> <mo style="border:1px" minsize="2" maxsize="2">⇨</mo> <mo style="border:1px" minsize="5">⇨</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21F0</mtext> <mrow> <mo style="border:1px">⇰</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇰</mo> <mo style="border:1px" minsize="2" maxsize="2">⇰</mo> <mo style="border:1px" minsize="5">⇰</mo> </mrow> </mfrac> <mspace linebreak="newline" indentalign="center"></mspace> <mfrac style="border:1px"> <mtext>21EB</mtext> <mrow> <mo style="border:1px">⇫</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇫</mo> <mo style="border:1px" minsize="2" maxsize="2">⇫</mo> <mo style="border:1px" minsize="5">⇫</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21EC</mtext> <mrow> <mo style="border:1px">⇬</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇬</mo> <mo style="border:1px" minsize="2" maxsize="2">⇬</mo> <mo style="border:1px" minsize="5">⇬</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21ED</mtext> <mrow> <mo style="border:1px">⇭</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇭</mo> <mo style="border:1px" minsize="2" maxsize="2">⇭</mo> <mo style="border:1px" minsize="5">⇭</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21EE</mtext> <mrow> <mo style="border:1px">⇮</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇮</mo> <mo style="border:1px" minsize="2" maxsize="2">⇮</mo> <mo style="border:1px" minsize="5">⇮</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21EF</mtext> <mrow> <mo style="border:1px">⇯</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇯</mo> <mo style="border:1px" minsize="2" maxsize="2">⇯</mo> <mo style="border:1px" minsize="5">⇯</mo> </mrow> </mfrac> <mfrac style="border:1px"> <mtext>21F3</mtext> <mrow> <mo style="border:1px">⇳</mo> <mo style="border:1px" minsize="1.2" maxsize="1.2" >⇳</mo> <mo style="border:1px" minsize="2" maxsize="2">⇳</mo> <mo style="border:1px" minsize="5">⇳</mo> </mrow> </mfrac> </math>