/fɔrml pruf/ – Phrase
Definition: 1. những chứng cứ hình thức;
2. chứng minh bằng những chứng cứ hình thức;
3. xác định sự việc bằng những chứng cứ hình thức.
A more thorough explanation: A formal proof is a rigorous and systematic demonstration of the truth or validity of a statement or proposition within a formal logical system, typically using a series of logical deductions or mathematical techniques to establish the correctness of the claim.
Example: The formal proof submitted by the defense attorney convinced the jury of the defendant’s innocence.