In the subject of differential equations, to solve some equations, we need to use the imaginary number of the square root of -1 (i).(that is imaginary number) The interesting thing is that this imaginary number (i) disappears in the process of solving the equations and finally we get a real number at the end ! (travel from imaginary to reality!) This part of mathematics has always been strange and surprised me. Mathematics is really amazing.

In the subject of differential equations, to solve some equations, we need to use the imaginary number of the square root of -1 (i).(that is imaginary number) The interesting thing is that this imaginary number (i) disappears in the process of solving the equations and finally we get a real number at the end ! (travel from imaginary to reality!) This part of mathematics has always been strange and surprised me. Mathematics is really amazing.