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<b>let </b><font color="Maroon">c<sub>1</sub></font>, <font color="Maroon">c<sub>2</sub></font> be   <a href="zf_lang.html#NM2">ZF-formula</a>;<br/>



<b>assume </b><a NAME="E1:72"/><i><font color="Green">E59</font></i>: 
<font color="Maroon">c<sub>1</sub></font> is <a href="zf_lang.html#V7" target="_self">atomic</a>
 ;<br/>

<div><i><font color="Green">E60</font></i>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="72_1"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:72_1"/>
<font color="Maroon">c<sub>1</sub></font> <a href="zf_lang.html#NR1" target="_self">is_equality</a> 
 ;<br/><a NAME="E2:72_1"/><b>then </b>
<font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K18" target="_self">Var1</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="zf_lang.html#K4" target="_self">'='</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K19" target="_self">Var2</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>
 <b>by </b><i><a class="ref" href="zf_lang.html#T53" target="_self">Th53</a></i>;<br/><b>hence </b><a NAME="E3:72_1"/>
not <font color="Maroon">c<sub>2</sub></font> <a href="zf_lang.html#R1" target="_self">is_immediate_constituent_of</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="ref" href="zf_lang.html#T69" target="_self">Th69</a></i>;<br/></div><b>end;</b></div>
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="72_2"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:72_2"/>
<font color="Maroon">c<sub>1</sub></font> <a href="zf_lang.html#NR2" target="_self">is_membership</a> 
 ;<br/><a NAME="E2:72_2"/><b>then </b>
<font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K18" target="_self">Var1</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="zf_lang.html#K5" target="_self">'in'</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K19" target="_self">Var2</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>
 <b>by </b><i><a class="ref" href="zf_lang.html#T54" target="_self">Th54</a></i>;<br/><b>hence </b><a NAME="E3:72_2"/>
not <font color="Maroon">c<sub>2</sub></font> <a href="zf_lang.html#R1" target="_self">is_immediate_constituent_of</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="ref" href="zf_lang.html#T70" target="_self">Th70</a></i>;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E4:72"/>
not <font color="Maroon">c<sub>2</sub></font> <a href="zf_lang.html#R1" target="_self">is_immediate_constituent_of</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="txt" href="zf_lang.html#E1:72"><i><font color="Green">E59</font></i></a>, <a class="txt" href="zf_lang.html#E2:72"><i><font color="Green">E60</font></i></a>, <a class="ref" href="zf_lang.html#D15" target="_self">Def15</a></i>;<br/>


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