Although the set of complex numbers constitute a field, unlike the fields of the rational numbers or the field of the real numbers, it is not an ordered field. That is to say there is no defined mathematical measurability of ‘greater than’ or ‘lesser than’ between any two complex numbers. By definition, complex numbers are found only on the complex plane except on the two axes which equally divide it into 4 quadrants. The horizontal real axis is also known as the real number line which extends to negative infinity on the left and to positive infinity on the right. At the midpoint of this line is the whole number zero. The vertical imaginary axis is also divided by zero which extends to positive imaginary infinity at the top and negative imaginary infinity at the bottom.
Nonetheless, two-dimensional equality can be defined as the equality of complex moduli. Since an arbitrary complex number Z is given by Z=A+Bⅈ where A and B are both real numbers and ⅈ is called the imaginary unit defined as the square root of negative unity, the complex modulus, |Z| is defined as the square root of the sum of A² and B² or equivalently: |Z|²=A²+B². In this sense, it is mathematically analogous to the Pythagorean Theorem for positive integers. This theorem was discovered by Pythagoras, between 585-500 BCE, more than 2500 years ago. In 300 BCE, Euclid gave a geometric proof in proposition 47 of Book I of his 13 books of the Elements, which is based on the defined area of triangles. The algebraic proof is given for 2 integers M and N such that M>N and M²-N², 2MN, M²+N² comprise a unique set of Pythagorean triples. However, in analytic geometry (combining algebra and geometry) this theorem is equivalent to the equation of a circle whose radius is equal the complex modulus. Therefore, two-dimensional equality is defined as all complex numbers that give the same complex modulus. Not surprisingly, there are infinitely many complex circles with infinitely many complex numbers that satisfy this equality condition.


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