The d M (calc-mathematica-language) command selects the
conventions of Mathematica. Notable differences in Mathematica mode
are that the names of built-in functions are capitalized, and function
calls use square brackets instead of parentheses. Thus the Calc
formula ‘sin(2 x)’ is entered and displayed ‘Sin[2 x]’ in
Mathematica mode.
Vectors and matrices use curly braces in Mathematica. Complex numbers
are written ‘3 + 4 I’. The standard special constants in Calc are
written Pi, E, I, GoldenRatio, EulerGamma,
Infinity, ComplexInfinity, and Indeterminate in
Mathematica mode.
Non-decimal numbers are written, e.g., ‘16^^7fff’. Floating-point
numbers in scientific notation are written ‘1.23*10.^3’.
Subscripts use double square brackets: ‘a[[i]]’.