All questions asked by Arthur

List all solved & unsolved questions asked by Arthur

Lorentz invariance of the Klein-Gordon equation action

1 Physics Asked on 11/28/2020

field theory lagrangian formalism quantum field theory spacetime special relativity

What are the current travel restrictions on individuals entering the United States from regions affected by Covid-19?

1 Travel Asked on 11/11/2021

covid 19 event based effects health usa

Germany: What happens if you test Covid positive on arrival

1 Travel Asked on 11/11/2021

covid 19 germany

How can I make sure I never board an airplane made by a particular manufacturer?

3 Travel Asked on 11/11/2021

Does a UK citizen need a visa to travel to and from the EU after Brexit?

3 Travel Asked on 11/08/2021

brexit residency visas

Where is this tower, likely photographed in Belgium about 100 years ago?

1 Travel Asked on 10/24/2021

france history identify this landmarks where on earth

Is this image, taken about 1900, actually from Nuremberg?

2 Travel Asked on 10/24/2021

history identify this landmarks where on earth zurich

Where was this picture taken? (Chromecast background, 3 steep rocks)

2 Travel Asked on 10/24/2021

identify this locate this photography remote locations

Identifying a church by a lake and a railway line, claimed to be in the Canton of Lucerne

1 Travel Asked on 10/24/2021

history identify this switzerland where on earth

What is the most isolated building in the world?

3 Travel Asked on 10/24/2021

architecture factoids remote locations where on earth

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