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  2. PDF Studio - Wikipedia

    en.wikipedia.org/wiki/PDF_Studio

    PDF Studio is a commercial desktop application from Qoppa Software to create, convert, review, annotate, and edit Portable Document Format (PDF) documents. System requirements [ edit ]

  3. Best Free PDF Editors of 2023 - AOL

    www.aol.com/best-free-pdf-editors-2023-204004606...

    PDFelement by Wondershare is another completely free PDF editor, and this one is available not just for Windows but also for Mac users. There is also a version for Android and iPhone users, as ...

  4. QR decomposition - Wikipedia

    en.wikipedia.org/wiki/QR_decomposition

    The QR decomposition via Givens rotations is the most involved to implement, as the ordering of the rows required to fully exploit the algorithm is not trivial to determine. However, it has a significant advantage in that each new zero element a i j {\displaystyle a_{ij}} affects only the row with the element to be zeroed ( i ) and a row above ...

  5. PDFtk - Wikipedia

    en.wikipedia.org/wiki/Pdftk

    PDFtk (short for PDF Toolkit) is a toolkit for manipulating Portable Document Format (PDF) documents. [3] [4] It runs on Linux, Windows and macOS. [5] It comes in three versions: PDFtk Server (open-source command-line tool), PDFtk Free and PDFtk Pro (proprietary paid). [2] It is able to concatenate, shuffle, split and rotate PDF files.

  6. QR algorithm - Wikipedia

    en.wikipedia.org/wiki/QR_algorithm

    Instead, the QR algorithm works with a complete basis of vectors, using QR decomposition to renormalize (and orthogonalize). For a symmetric matrix A , upon convergence, AQ = QΛ , where Λ is the diagonal matrix of eigenvalues to which A converged, and where Q is a composite of all the orthogonal similarity transforms required to get there.

  7. List of PDF software - Wikipedia

    en.wikipedia.org/wiki/List_of_PDF_software

    As with Adobe Acrobat, Nitro PDF Pro's reader is free; but unlike Adobe's free reader, Nitro's free reader allows PDF creation (via a virtual printer driver, or by specifying a filename in the reader's interface, or by drag-'n-drop of a file to Nitro PDF Reader's Windows desktop icon); Ghostscript not needed.