Objects in 3D space: color contrast to the background

Is there a tool that allows me to choose the right colors for the following:

  1. objects
  2. background

in the 3D room. Colors should have the right contrast.

TO UPDATE

An example of my background color options is:

Background Color: #c8c8c8c Object color: #576675

Background color = # c8c8c8

Background Color: #888888 Object color: #576675

Background color = # 888888

Background Color: #444444 object color #576675

Background color: # 444444

oa.operator algebras – Compute norms of operator's polynomials in Hilbert space and generalize von Neumann inequality

To let $ T $ to be an operator $ l ^ 2 ({ mathbb {Z} _ { geq 0}}) to l ^ 2 ({ mathbb {Z} _ { geq 0}}) $. $ e_n mapsto sqrt {1 – q ^ {2 (n + 1)}} e_ {n + 1} $, Where $ 0 <q <1 $, I would like to calculate $ | f (T, T ^ {*}) | $ (Operator norm) for each $ f in mathbb {C} (z, bar z) $, operator $ T ^ {*} $Of course this is the Hilbert conjugate and $ T ^ {*} e_0 = 0 $. $ T ^ {*} e_n = sqrt {1-q ^ {2n}} e_ {n-1} $ to the $ n> 0 $,

I am not sure if this calculation is possible at all, and I would like to show that $ | f (T, T ^ {*}) | to sup limits_ {| z | leq 1} f (z, bar z) $ as $ q $ goes to 1, because I actually have to calculate standards first.

I think that there is a generalization of von Neumann's inequality $ q $analogue or so (there are many generalizations) because the usual inequality proves this for polynomials $ g in mathbb {C} (z) $ (without $ bar z $).

Question: Does anyone know of useful facts or inequalities related to my question? Something that could help.

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sg.symplectic geometry – Explanation of the "neck strain" applied to the basic space of a Lefschetz-Fibration

I ask this question because I want to better understand the argument of neck elongation in symplectic geometry and the possible conclusions in my environment.

Suppose I have a Lefschetz fibrillation $ E $ about $ M $, Where $ M $ is an exact symplectic manifold (possibly with ends). To let $ C $ be a contact type codimension $ 1 $ Subtype of $ M $, As far as I understand, when I stretch my neck $ C $ I create a family of manifolds $ M_t $. $ t in Bbb R ^ + $ (With $ M_0 = M $) all symplectomorph too $ M $"Showing the stretching of the neck" around $ C $ at the time $ t geq 0 $,

According to the thesis of Evans (E)This process tends to a limit $ M _ { infty} $ which is obtained from $ M $ by cutting $ C $ and sticking the positive / negative part of the symplectization of $ C $ (In the work it is called as $ Bbb S _ { pm} (C) $, I believe that this process should similarly lead to a family of Lefschetz fibrations $ E_t $ about $ M_t $ and a limiting vibration $ E _ { infty} $ (I believe we put something trivial on the ends we introduce).

I am interested in understanding the moduli space of pseudo-holomorphic portions of such a vibration. Let's say I have chosen a generic compatible AC. structure $ J $ and I remember that I have no bubbling due to my accuracy assumption. From my stretching process, a family of manifolds arises $ mathcal {M} _t $, What can I say about this family of module spaces? How do I deal with the borderline case? $ mathcal {M} _ { infty} $? Is it somehow a limit to the family of spaces that are parametrized by the positive realities?

I think I can come up with a naïve rationale for my claim, but trying to push it to the limit, I expect many technical issues and I do not know them yet.

Can somebody point out to me if there are obvious obstacles / difficulties in what I am trying to understand and if there is literature that somehow sheds light on what I am trying to understand?

Thanks in advance for all comments!

references

(E) Jonathan David Evans – Symplectic topology of some stone and rational surfaces

Air travel – is it safe to buy a plane ticket to fly between Schengen space cities in November with a British airline?

I have to fly between Zurich and Berlin at the end of November, the price for an EasyJet flight is 150, the flight with Lufthansa or Swiss Air 250. Normally I would fly only with the cheapest option, but in this case with EasyJet I'm afraid a British Company may have lost its right to fly between Schengen space airports, even if it came to a violent exit on 31 October. I have not found clear information on what might happen in this case, and I am afraid that the flight will be canceled and I am forced to book a very expensive last-minute flight.

Any thoughts on the risk of buying tickets from a British flag company?