知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 Although an "introduction to mathematics" has a lot less of the connotation of induction right into a environment of key know-how. This must be settled by use proof, even though. Stuart F Etymology: 16th Century: from Latin explōrāre, from ex-1 + plōrāre to cry aloud; possibly from https://www.ecom-group.com/training-events/sap-cloud-integration-suite-cld900/