De morgan   <br/><br/>
Elements of algebra 

 -  1848 
<br/><br/><label>Standard No.: </label>338993 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MATHEMATICS
<br/><br/><label>Dewey Class. No.: </label>B2, 155A8