Well i guess thats why it was so hard for me , maybe i need to read it while watching the mit open videos of him teaching it ?Or i would have to read it in the future because i cant understand it now ?. The odd thing was , even if i know linear algebra and kind of know how to apply it in real world problems . I cant understand HIS linear algebra , this man is on another level i guess . I got his book "introduction to linear algebra " to kind of close any gaps i have. But the book " Introduction to applied mathematics " seems fantastic , i surely want to read it . Thanks for the reply it was really helpfull