src/HOL/Library/Product_plus.thy
changeset 58881 b9556a055632
parent 57512 cc97b347b301
child 59815 cce82e360c2f
     1.1 --- a/src/HOL/Library/Product_plus.thy	Sun Nov 02 17:16:01 2014 +0100
     1.2 +++ b/src/HOL/Library/Product_plus.thy	Sun Nov 02 17:20:45 2014 +0100
     1.3 @@ -2,7 +2,7 @@
     1.4      Author:     Brian Huffman
     1.5  *)
     1.6  
     1.7 -header {* Additive group operations on product types *}
     1.8 +section {* Additive group operations on product types *}
     1.9  
    1.10  theory Product_plus
    1.11  imports Main