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|     19 <dl> |     19 <dl> | 
|     20  |     20  | 
|     21 <dt><a |     21 <dt><a | 
|     22 href="library/HOL/index.html"><strong>Isabelle/HOL</strong></a><dd> is |     22 href="library/HOL/index.html"><strong>Isabelle/HOL</strong></a><dd> is | 
|     23 a version of classical higher-order logic resembling that of the <A |     23 a version of classical higher-order logic resembling that of the <A | 
|     24 HREF="http://www.cl.cam.ac.uk/Research/HVG/HOL/HOL.html">HOL |     24 HREF="http://www.cl.cam.ac.uk/Research/HVG/HOL/">HOL System</A>. The | 
|     25 System</A>. |     25 main libraries of the HOL 4 System are now <a | 
|         |     26 href="library/HOL/HOL-Complex/HOL4/index.html">available in | 
|         |     27 Isabelle</a>. | 
|     26  |     28  | 
|     27 <dt><a |     29 <dt><a | 
|     28 href="library/HOLCF/index.html"><strong>Isabelle/HOLCF</strong></a><dd> |     30 href="library/HOLCF/index.html"><strong>Isabelle/HOLCF</strong></a><dd> | 
|     29 adds Scott's Logic for Computable Functions (domain theory) to HOL. |     31 adds Scott's Logic for Computable Functions (domain theory) to HOL. | 
|     30  |     32  |