What does QED mean?

Question

It's an abbreviation of the Latin phrase "quod erat demonstrandum". But when I looked it up on Google it didn't make any sense. Can someone explain it in REALLY simple terms please? Thanks.

Answer 1

my old ex-catholic many years in their schools-days say that 'quod erat demnstrandum' means something like, you can demonstrate if you want; or who is demonstrating, meaning the beings demonstrating at that time...

and you should hear me try to interpret greek!

Answer 2

Q.E.D. is an abbreviation of the Latin phrase "quod erat demonstrandum" (literally, "which was to be demonstrated", and figuratively, "I rest my case"). The phrase is written in its abbreviated form at the end of a mathematical proof to signify that the last statement deduced was the one to be demonstrated, so the proof is complete.

Answer 3

Q.E.D. is an abbreviation of the Latin phrase "quod erat demonstrandum" (literally, "which was to be demonstrated", and figuratively, "I rest my case").

Simply explained:
When you write something down and put QED at the end, it means:
That what you've written is proof positive of what you've been saying.

Answer 4

1 quantum electrodynamics
2 [Latin quod erat demonstrandum] which was to be demonstrated
the second one is used to refer to a proof as in what is demonstrated

Answer 5

Latin: Quod erat demonstrandum, "which is what was to be proved."

Answer 6

Q.E.D. is an abbreviation of the Latin phrase "quod erat demonstrandum" (literally, "which was to be demonstrated"). In simple terms, the use of this Latin phrase is to indicate that something has been definitively proven.

Answer 7

Quantum Electrodynamics lol.
Wiki says "that which was to be demonstrated" or "I rest my case" Q.E.D. is often used at the end of proofs to demonstrate something has been proven. For example, in formal geometry textbooks.