[Q]: In mathematics, an O*-algebra is an algebra of possibly unbounded operators defined on a dense subspace of a Hilbert space. The original examples were described by and , who studied some examples of O*-algebras, called Borchers algebras, arising from the Wightman axioms of quantum field theory. and began the systematic study of algebras of unbounded operators. O algebra is a form of biology
[A]: No

[Q]: A.C. Milan is in second place with 13 points, after two first-half goals from captain Paolo Maldini earned them a 2-1 victory over Reggina. Paolo Maldini is the reason Milan is in second place.
[A]: It's impossible to say

[Q]: The chain of events which led to the collapse of Barings, Britain's oldest merchant bank, is a demonstration of how not to manage a derivatives operation. It collapsed because of a building error
[A]: It's impossible to say

[Q]: The Red Devils can now no longer finish in the top four and must win the Europa League final against Ajax to secure Champions League football. Harry Kane and Victor Wanyama both got on the score sheet for the home side following some sloppy defending. And Jose Mourinho wasn't impressed with the way the goals were conceded. He said: "After 2-0 we had to bring a bit more quality to the team, we brought more balance. We put players back in the right positions. I’m happy, I’m fine with what we had in terms of individual performances. The two goals conceded were bad. In future games, Jose Mourinho was impressed with the way the goals were conceded.
[A]: