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<div><span class="kw">theorem </span><a NAME="T30"><span class="comment"><font color="firebrick">:: SRINGS_5:30</font></span><br/></a><div class="add"> <a href="srings_5.html#K11" title="SRINGS_5:func.11">the_set_of_all_left_open_real_bounded_intervals</a>  is   <a href="srings_3.html#NM1" title="SRINGS_3:NM.1">Semiring</a> of <a href="numbers.html#K1" title="NUMBERS:func.1">REAL</a> <span class="kw">by</span> <span class="lab"><a class="ref" href="srings_5.html#T29" target="_self" onmouseover="rs('srings_5/T29')" onmouseout="rh()">Th26</a>, <a class="ref" href="srings_3.html#T10" onmouseover="rs('srings_3/T10')" onmouseout="rh()">SRINGS_3:10</a></span>;<br/></div></div>
