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<b>take </b>
 <a href="topreal9.html#K1" title="TOPREAL9:func.1">Ball</a> <span class="p1">(<span class="default"><a href="euclid.html#K16" title="EUCLID:func.16">0.REAL</a> <font color="Maroon" title="c7">n</font></span>)</span>,1
;<br/>

<b>thus </b><a NAME="E1:41_2_1"/>
( not  <a href="topreal9.html#K1" title="TOPREAL9:func.1">Ball</a> <span class="p1">(<span class="default"><a href="euclid.html#K16" title="EUCLID:func.16">0.REAL</a> <font color="Maroon" title="c7">n</font></span>)</span>,1 is <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a> &amp;  <a href="topreal9.html#K1" title="TOPREAL9:func.1">Ball</a> <span class="p1">(<span class="default"><a href="euclid.html#K16" title="EUCLID:func.16">0.REAL</a> <font color="Maroon" title="c7">n</font></span>)</span>,1 is <a href="pre_topc.html#V3" title="PRE_TOPC:attr.3">open</a> &amp;  <a href="topreal9.html#K1" title="TOPREAL9:func.1">Ball</a> <span class="p1">(<span class="default"><a href="euclid.html#K16" title="EUCLID:func.16">0.REAL</a> <font color="Maroon" title="c7">n</font></span>)</span>,1 is <a href="jordan1.html#V1" title="JORDAN1:attr.1">convex</a> &amp;  <a href="topreal9.html#K1" title="TOPREAL9:func.1">Ball</a> <span class="p1">(<span class="default"><a href="euclid.html#K16" title="EUCLID:func.16">0.REAL</a> <font color="Maroon" title="c7">n</font></span>)</span>,1 is <a href="jordan2c.html#V1" title="JORDAN2C:attr.1">Bounded</a> )
 ;<br/>


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