Numerical inversion of Laplace transforms

: = RH The characters introduced by tim substitution process have t, he following memfings: G an integer N 't number containing a decimal point N L an incomplete number, ending in 10 N2 an in.complete mm~ber, ending in ~0± N* "~ number ending with an exponent, of 10 I an identifier; a letter followed by letters or digits V % subscripted v-mable E a parenthesized expression S a bracketed subscript O . a unary arithmetic operator (/)~, a binary operator @~, an ambiguous operator ( + or ) , unary or binary according to context t!;~ an expression followed by a comma E~p an expression followed by a right parenthesis E,,b an expression (or list of expressions separated by commas) followed by a right bracket Et an expression followed by a semicolon R H the replacement operator := followed by Et Z an identifier or subscripted variable followed by RH; a well-f0rmed formula F a function