Indices什么意思

"Indices" is the plural form of the word "index." Depending on the context, an index can refer to:

  1. A number used to locate an element in a list, array, or string: For example, in the string "CRANE," the letter 'E' has the index 5 (counting from 0).

  2. A measure of change: In economics, an index like the Consumer Price Index (CPI) measures changes in the price of a representative basket of goods and services.

  3. A guide or list of names or subjects at the end of a book: This allows readers to find the pages on which a specific topic or person is mentioned.

  4. A symbol used to indicate the power of a number: For example, in the expression "x^2," the superscript 2 is an index indicating that the variable x is being squared.

  5. A stock market index: A mathematical average of a group of stocks that is used to measure the performance of the stock market or a segment of it, such as the Dow Jones Industrial Average (DJIA) or the S&P 500.

In mathematics, the term "indices" is often used when referring to the powers or exponents of numbers, as in "working with indices." This typically involves manipulating expressions involving powers and understanding the rules of exponents, such as the product rule (when multiplying two numbers with the same base, you add the exponents) and the quotient rule (when dividing two numbers with the same base, you subtract the exponents).