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<b>let </b><font color="Maroon" title="c1">L</font> be  non <a href="struct_0.html#V3" title="STRUCT_0:attr.3">empty</a>  <a href="sheffer1.html#L1" title="SHEFFER1:struct.1">ShefferStr</a> ;<br/>

<b>assume </b><a NAME="E1:71"/>
<font color="Maroon" title="c1">L</font> is <a href="sheffer2.html#V1" title="SHEFFER2:attr.1">satisfying_Sh_1</a>
 ;<br/>

<a NAME="E2:71"/><b>then </b>
for <font color="Olive" title="b1">x</font>, <font color="Olive" title="b2">y</font> being  <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">L</font> holds  <font color="Olive" title="b1">x</font> <a href="sheffer1.html#K5" title="SHEFFER1:func.5">|</a> <span class="p1">(<span class="default"><font color="Olive" title="b2">y</font> <a href="sheffer1.html#K5" title="SHEFFER1:func.5">|</a> <span class="p2">(<span class="default"><font color="Olive" title="b2">y</font> <a href="sheffer1.html#K5" title="SHEFFER1:func.5">|</a> <font color="Olive" title="b2">y</font></span>)</span></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b1">x</font> <a href="sheffer1.html#K5" title="SHEFFER1:func.5">|</a> <font color="Olive" title="b1">x</font>
 
<b>by </b><i><a class="ref" href="sheffer2.html#T59" target="_self" title="SHEFFER2:th.59">Th59</a></i>;<br/>
<b>hence </b><a NAME="E3:71"/>
<font color="Maroon" title="c1">L</font> is <a href="sheffer1.html#V11" title="SHEFFER1:attr.11">satisfying_Sheffer_2</a>
 <b>by </b><i><a class="ref" href="sheffer1.html#D14" title="SHEFFER1:def.14">SHEFFER1:def 14</a></i>;<br/>


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