Englishfor English speakers
fatigue
Noun
—
Fatigue is the extreme tiredness which is the result of having mental or physical exertion or illness.
—
Fatigue is the material failure, such as cracking or separation, caused by stress on the material.
failures due to fatigue have been the subject of engineering efforts for more than 150 years.
proof
Noun
—
Proof is evidence which shows something is correct.
He has proof that he was not at the crime scene. A witness says that they were somewhere else.
—
A proof can show how a theorem is correct.