In advanced mathematics, Im means "image". Definition: The image of the vector space V under the functional f is a subspace of V, which is called the image of F and denoted as Im(F), that is, Im(F)=F(V).
To define Im is to divide the imaginary part of a complex number by I, and a complex number X is marked as A+Bi, and im [x] = b/I, for example: Im[5+3i]=3, Re[ 10+2i]=2.
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After many mathematicians' unremitting efforts for a long time, the complex number theory has been deeply discussed and developed, which makes the ghost of imaginary number, which has been wandering in the field of mathematics for 200 years, unveil its mysterious veil and reveal its true colors. The original imaginary number is not "imaginary". The imaginary number has become a member of the family of number systems, so the real number set has been extended to the complex number set.
With the progress of science and technology, complex number theory becomes more and more important. It is not only of great significance to the development of mathematics itself, but also plays an important role in proving the basic theorem of wing lift, showing its power in solving the seepage problem of dams and providing an important theoretical basis for the construction of giant hydropower stations.
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