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beepb00p.xyz
A blog post offering an overview of tools and strategies for annotating content, including highlighting and note-taking as the author reads. It reviews annotation tools for the web, PDFs, e-ink devices, paper books, plaintext and videos, and discusses how annotation data can be used.
matrixcalc.org
MatrixCalc is a web-based matrix calculation tool. It performs matrix operations including addition, multiplication, inversion, determinant and rank calculation, transposition, diagonalization, row echelon form conversion, exponentiation, LU decomposition, QR decomposition, and singular value decomposition. It also solves systems of linear equations with step-by-step solutions. Users can input decimal fractions, mathematical expressions, matrix literals, and use built-in functions for calculations.