Last Updated：2025/12/31
Sentence
In
Section
4.3
we
introduced
the
imaginary
unit
i
with
(i)²=-1,
in
the
complex
space
domain.
In
section
4.4
we
introduced
the
complex
unit
j
with
(j)²=-1,
in
connection
with
the
time
dependency
of
the
shape
(4.4.16)
of
the
swimming
profile.
These
different
imaginary
units
have
no
interaction,
we
leave
unaltered
the
product
ij.
Quizzes for review
In Section 4.3 we introduced the imaginary unit i with (i)²=-1, in the complex space domain. In section 4.4 we introduced the complex unit j with (j)²=-1, in connection with the time dependency of the shape (4.4.16) of the swimming profile. These different imaginary units have no interaction, we leave unaltered the product ij.
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