The symbol of infinitesimal is O, and infinitesimal is usually represented by lowercase Greek letters, such as α, β, ε, etc. , and sometimes α(x), ο(x) and so on. It shows that infinitesimal is a function with x as the independent variable. For any positive number (no matter how small), there is always a positive number (or positive number) that makes all the corresponding function values of inequality (or) satisfy inequality, so when (or), the function is called infinitesimal.

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Infinity includes positive infinity and negative infinity. Positive infinity, in the range of real numbers, means that rational numbers greater than zero or irrational numbers are infinite. There is no specific number, but positive infinity means a value greater than any number. The symbol is+∞. A point on the number axis can be represented as an infinite arrow to the right. Negative infinity, a way that a negative value represents infinitesimal, there is no specific number, but negative infinity represents a value smaller than any number. The symbol is-∞.