A polynomial equation of order >1 that is, where the power of the variable is greater than 1 is a non linear function. A transcendental function is one that cannot be expressed as a finite number of algebaraic operations (addition, multiplication, roots). The exponential and trigonometric functions (and their inverses) are examples.
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linear system is like a chemistry equation or math equation where on both sides it must balance. Nonlinear is a math equation or physics that does not appear to have a direct answer just like chaos theory. lulu254ever
Expression has no answer. a equation has an answer
Nonlinear do not satisfy the superposition principle. Linear problems, as implied, do.
an equation has an equals sign.
An expression has no equal sign whereas an equation does have an equal sign