Yes, I can't think of any way that a real number minus another real number would be complex or purely imaginary.
My answer is yes.
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Integer numbers are a subset of real numbers. Real numbers may contain fractions.
No difference. The set of complex numbers includes the set of imaginary numbers.
The graph of imaginary numbers takes two axes. A part for the real part and the i part.
A natural number is a counting number, such as 1, 2, 3. There are also known as whole numbers and integers. They can be infinitely large. A real number is a number, possibly a natural number, but more possibly not, because there are an infinite number of real numbers that lie between any two natural numbers, such as 1, 1.1, 1.11, 1.111, 111112, etc, ad infinitum. Real numbers can also be infinitely large.
Graphically the difference is quite clear: the real numbers can be put on a line, the so-called number-line; while complex numbers are represented as points on a plane. A complex number is made up of two parts, like a vector in two dimensions.