Penning, Christiaan Jan,  1931- <br/><br/>
Boolean metric spaces/ 
Christiaan Jan Penning. 
 - Assen:  Van Gorcum,  [1960]. 
 - 70 p.:  ill., diagrs.;  25 cm. 
<br/><br/> Vita.  "Stellingin" ([3] p.) inserted.  Errata slip inserted. 
<br/><br/>Proefschrift--Technische Hogeschool te Delft, 1960. 
<br/><br/>Bibliography: p. 69-70. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Algebra, Boolean.
<br/><br/><label>Dewey Class. No.: </label>514.3   / P414b