Project Gutenberg 2012-03-09 Public domain in the USA. 93 De Morgan, Augustus 1806 1871 Morgan, Augustus de On the study and difficulties of mathematics en Algebra Geometry Mathematics -- Study and teaching QA Text Mathematics Browsing: Mathematics Browsing: Science - General 1444917 2013-02-17T16:52:41 application/pdf 1199354 2013-02-17T16:52:42 application/pdf application/zip 554309 2021-06-11T17:21:28 application/prs.tex 487752 2021-06-11T17:21:28 application/prs.tex application/zip 9715 2024-08-16T11:56:15.460486 application/rdf+xml 15569 2024-08-16T11:56:15.385492 image/jpeg 3546 2024-08-16T11:56:15.211486 image/jpeg Archives containing the RDF files for *all* our books can be downloaded at https://www.gutenberg.org/wiki/Gutenberg:Feeds#The_Complete_Project_Gutenberg_Catalog en.wikipedia