An L-shaped hallway with a width of 1
Problem of finding the area of the widest shape (sofa shape) that can pass through
Because the shape usually looks like a sofa
It’s called the sofa problem. (moving sofa problem)

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This is a failure

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2.2074mn’
The phone-shaped figure proposed by a mathematician named Hammersley was the widest for about 30 years.
The area of this shape is 2.2074

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In 1992, a mathematician named Gerber
Presents a slightly improved shape of the Hammersley sofa.
The area of this shape is slightly wider than 2.2074.
2.2195
A problem arises here
I think Gerber’s shape is the maximum.
There is no proof!!!
32 years of tormenting mathematicians like that

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Research on Baek Jin-eon, a young mathematician who solved the ‘sofa problem’
Meet Wonyul
A difficult problem that has not been resolved for 60 years; Solve it in one formula
2024
Dr. Jin-eon Baek from Yonsei University
Proof that Gerber is correct
The paper is still on arXive, but
Evaluation that it has been proven in the domestic mathematics community
Dr. Baek Jin-eon is a great person.
A family receiving basic livelihood security => Korea Science High School in Busan => Pohang University of Science and Technology => Doctor at the University of Michigan, USA => Researcher at Yonsei University
A dragon from a stream