# Richter Substitution Principle

By [rojeck](https://paragraph.com/@rojeckluo) · 2021-11-13

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    The definition of the Liskov Substitution Principle (LSP) is: all references to the base class must be able to transparently use the objects of its subclasses, or it can be simply understood as any place where the base class can appear, the subclass must be able to Appear.

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*Originally published on [rojeck](https://paragraph.com/@rojeckluo/richter-substitution-principle)*