Metamath Proof Explorer


Theorem helloworld

Description: The classic "Hello world" benchmark has been translated into 314 computer programming languages - see http://helloworldcollection.de . However, for many years it eluded a proof that it is more than just a conjecture, even though a wily mathematician once claimed, "I have discovered a truly marvelous proof of this, which this margin is too narrow to contain." Using an IBM 709 mainframe, a team of mathematicians led by Prof. Loof Lirpa, at the New College of Tahiti, were finally able to put it to rest with a remarkably short proof only four lines long. (Contributed by Prof. Loof Lirpa, 1-Apr-2007) (Proof modification is discouraged.) (New usage is discouraged.)

Ref Expression
Assertion helloworld ¬ h L L 0 W 𝑹 1 d

Proof

Step Hyp Ref Expression
1 noel ¬ W 𝑹 1 d
2 df-br W 𝑹 1 d W 𝑹 1 d
3 1 2 mtbir ¬ W 𝑹 1 d
4 3 intnan ¬ h L L 0 W 𝑹 1 d