As long as you are an economics major, you should learn these math things. The general financial society has a lot of knowledge about modeling analysis, statistics and introductory theory, but these advantages complement each other. You can't do it without a foundation of high numbers. So there is no professional introduction. Look at the financial talents on Wall Street. Many of them are not from finance, but mostly from applied mathematics and statistics. Therefore, there is no professional introduction, so we can only say that we must learn math well when studying finance and economics.