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tool, mathematics An extensible, advanced desk calculator
and mathematical tool written in Emacs Lisp by Dave
Gillespie Calc runs as part of GNUEmacs. You can use Calc as only a simple four-function
calculator, but it also provides additional features including
choice of algebraic or RPN (stack-based) entry,
logarithms, trigonometric and financial functions, arbitraryprecision, complex numbers, vectors, matrices, dates, times,
infinities, sets, algebraic simplification, differentiation,
and integration.