Collection of Open Letters to Iranian and Economists for Increasing the Value of the Currency
and Preservation of Capital and Increasing the Profit in the Economy of Iran
Mathematical analysis of the efficiency of the capital market and lowering the risk for investors in the stock market and OTC, if a line is tangent to a curve of a function (or two curves are tangent together) the equation of touching the curve and the line has double root which the double root is the length of the touching point. Explanation, using optimized ways for production and keeping inventors and scientists of knowledge enterprise companies is an obligation yet to be taken on the shoulder of holding companies. But they do not care about the costs on researches. Thus we will have:
Therefore, the equation x2-2x-3+c=0 must have double root denoting (delta or delta prime) of the equation equals 0.