√(a^2+b^2)≥(c^2+d^2)。 Cauchy inequality is an inequality discovered by Cauchy during his research. It is widely used to solve the related problems of inequality proof, so it is very important in the promotion and research of advanced mathematics, and it is one of the research contents of advanced mathematics.

Generally, pure is greater than the sign ">" and less than the sign ".Usually, the number in inequality is a real number, and letters also represent real numbers. The general form of inequality is F(x, y, ..., z)≤G(x, y, ..., z) (in which inequality symbols can also be one of them), and the common domain of analytic expressions on both sides is called inequality domain. Inequality can represent either a proposition or an inequality.

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Cauchy inequality is an inequality discovered by Cauchy during his research. It is widely used to solve the related problems of inequality proof, so it is very important in the promotion and research of advanced mathematics, and it is one of the research contents of advanced mathematics.

It is said that when the Journal of the French Academy of Sciences was first published, there were too many works by Cauchy, and the Academy had to pay a lot of printing expenses, which exceeded the budget of the Academy. So later, the Academy of Sciences stipulated that the longest paper could only reach four pages. Cauchy's longer paper had to be handed in elsewhere.