既知

1. Origins, structure, and basic meaning

• Structure: 既知 (きち) means already known. 既知の問題 modifies an established problem; 既知として assigns a value the status of being known.
• Basic usage: Past materials can address a known problem, while an equation is solved by treating one value as given.

2. Common pitfalls and similar expressions

• A previously known problem and a value treated as known
  • 既知の describes an existing epistemic status. 既知として additionally performs an analytical assignment, treating a value as a premise; context controls the contrast with 未知.