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2. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   A commercial PDF editor, markup and collaboration product aimed at engineering and architectural markets. Foxit Reader: Freeware: Highlight text, draw lines, measure distances of PDF documents. Foxit PDF Editor Suite: Free trial: Integrated PDF Editing and eSign anywhere. Optionally, ChatGPT+ gDoc Fusion: Proprietary/Shareware

3. Manfredo do Carmo - Wikipedia

   en.wikipedia.org/wiki/Manfredo_do_Carmo

   Manfredo Perdigão do Carmo (15 August 1928, Maceió – 30 April 2018, Rio de Janeiro) was a Brazilian mathematician. He spent most of his career at IMPA and is seen as the doyen of differential geometry in Brazil.

4. Smallpdf.com - Wikipedia

   en.wikipedia.org/wiki/Smallpdf.com

   Smallpdf is a Swiss online web-based PDF software, founded in 2013. [2] It offers free version with limited features to compress, convert and edit PDF documents. [ 3 ] And its paid version offers advanced features like OCR, compress, and more [ 4 ] .

5. PDFedit - Wikipedia

   en.wikipedia.org/wiki/PDFedit

   PDFedit is a free PDF editor for Unix-like operating systems (including Cygwin on top of Windows). It does not support editing protected or encrypted PDF files or word processor-style text manipulation, however. [1] PDFedit GUI is based on the Qt 3 toolkit and scripting engine , so every operation is scriptable.

6. Sumatra PDF - Wikipedia

   en.wikipedia.org/wiki/Sumatra_PDF

   Sumatra PDF is a free and open-source document viewer that supports many document formats including: Portable Document Format (PDF), Microsoft Compiled HTML Help (CHM), DjVu, EPUB, FictionBook (FB2), MOBI, PRC, Open XML Paper Specification (OpenXPS, OXPS, XPS), and Comic Book Archive file (CB7, CBR, CBT, CBZ). [3]

7. Hilbert's theorem (differential geometry) - Wikipedia

   en.wikipedia.org/wiki/Hilbert's_theorem...

   This proof is basically the same as in Hilbert's paper, although based in the books of Do Carmo and Spivak. Observations : In order to have a more manageable treatment, but without loss of generality , the curvature may be considered equal to minus one, K = − 1 {\displaystyle K=-1} .