Describing a relationship, equation, or function where the output is not directly proportional to the input, meaning the graph does not form a straight line. Changes in input produce disproportionate changes in output.
From Latin 'non-' meaning 'not' and 'linearis' meaning 'of a line'. The term gained prominence in the 20th century as mathematicians and scientists encountered increasingly complex systems that couldn't be described by simple linear relationships.
Nonlinear is where mathematics gets wild and unpredictable! While linear functions are like well-behaved highways, nonlinear functions are like mountain roads full of curves, jumps, and surprises - they're what make chaos theory, population dynamics, and the stock market so fascinatingly complex.
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