**Theorem 1.** A real number can never be equal to imaginary number.

**Proof: **Let a≠ 0 and b≠ o are real numbers such that

**Proof:** (a + ib) = 0

a2 = (-ib)2 = i2b2 = -b2

a2 + b2 = 0

a = 0 and b = 0

**Theorem 3:** Two complex numbers are equal only when their real and imaginary parts are separately equal.

**Proof:** (a +ib) = (c + id)

(a + ib) – (c+id) = 0

(a – c) + i (b – d) = 0

(a – c) = 0 & (b – d) = 0

a = c & b = d

**Theorem 4: If z є C, then;**

i) Line(z) = z

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