. Usually, the 1st volume specials with differential and integral calculus in $mathbf R $ and differential calculus in $mathbf R ^n$, and the second quantity discounts with different State-of-the-art matters. Even so, even the calculus product in the main quantity is taught in a relatively State-of-the-art way (for example, https://tarotista-jesus71581.bloguetechno.com/the-best-side-of-por-qué-es-bueno-leer-el-tarot-71483138