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In mathematics, a locally profinite group is a hausdorff topological group in which every neighborhood of the identity element contains a compact open subgroup. Equivalently, a locally profinite group is a topological group that is hausdorff locally compact and totally disconnected. Moreover, a locally profinite group is compact if and only if it is profinite; this explains the terminology. Basic examples of locally profinite groups are discrete groups and p-adic Lie group. Non-examples are real Lie groups which have no small subgroup property.

In a locally profinite group, a closed subgroup is locally profinite, and every compact subgroup is contained in an open compact subgroup.

Examples

Important examples of locally profinite groups come from algebraic number theory. Let F be a non-archimedean local field. Then both F and $F^{\times }$ are locally profinite. More generally, the matrix ring $\operatorname {M} _{n}(F)$ and the general linear group $\operatorname {GL} _{n}(F)$ are locally profinite. Another example of a locally profinite group is the absolute Weil group of a non-archimedean local field: this is in contrast to the fact that the absolute Galois group of such is profinite (in particular compact).

Representations of a locally profinite group

Let G be a locally profinite group. Then a group homomorphism $\psi :G\to \mathbb {C} ^{\times }$ is continuous if and only if it has open kernel.

Let $(\rho ,V)$ be a complex representation of G. $\rho$ is said to be smooth if V is a union of $V^{K}$ where K runs over all open compact subgroups K. $\rho$ is said to be admissible if it is smooth and $V^{K}$ is finite-dimensional for any open compact subgroup K.

We now make a blanket assumption that $G/K$ is at most countable for all open compact subgroups K.

The dual space $V^{*}$ carries the action $\rho ^{*}$ of G given by $\langle \rho ^{*}(g)\alpha ,v\rangle =\langle \alpha ,\rho ^{*}(g^{-1})v\rangle$. In general, $\rho ^{*}$ is not smooth. Thus, we set ${\widetilde {V}}=\bigcup _{K}(V^{*})^{K}$ where $K$ is acting through $\rho ^{*}$ and set ${\widetilde {\rho }}=\rho ^{*}$. The smooth representation $({\widetilde {\rho }},{\widetilde {V}})$ is then called the contragredient or smooth dual of $(\rho ,V)$.

The contravariant functor

$(\rho ,V)\mapsto ({\widetilde {\rho }},{\widetilde {V}})$

from the category of smooth representations of G to itself is exact. Moreover, the following are equivalent.

• $\rho$ is admissible.
• ${\widetilde {\rho }}$ is admissible.
• The canonical G-module map $\rho \to {\widetilde {\widetilde {\rho }}}$ is an isomorphism.

When $\rho$ is admissible, $\rho$ is irreducible if and only if ${\widetilde {\rho }}$ is irreducible.

The countability assumption at the beginning is really necessary, for there exists a locally profinite group that admits an irreducible smooth representation $\rho$ such that ${\widetilde {\rho }}$ is not irreducible.

Hecke algebra of a locally profinite group

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Let $G$ be a unimodular locally profinite group such that $G/K$ is at most countable for all open compact subgroups K, and $\rho$ a left Haar measure on $G$. Let $C_{c}^{\infty }(G)$ denote the space of locally constant functions on $G$ with compact support. With the multiplicative structure given by

$(f*h)(x)=\int _{G}f(g)h(g^{-1}x)d\mu (g)$

$C_{c}^{\infty }(G)$ becomes not necessarily unital associative $\mathbb {C}$-algebra. It is called the Hecke algebra of G and is denoted by ${\mathfrak {H}}(G)$. The algebra plays an important role in the study of smooth representations of locally profinite groups. Indeed, one has the following: given a smooth representation $(\rho ,V)$ of G, we define a new action on V:

$\rho (f)=\int _{G}f(g)\rho (g)d\mu (g).$

Thus, we have the functor $\rho \mapsto \rho$ from the category of smooth representations of $G$ to the category of non-degenerate ${\mathfrak {H}}(G)$-modules. Here, "non-degenerate" means $\rho ({\mathfrak {H}}(G))V=V$. Then the fact is that the functor is an equivalence.

Notes

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References

• Corinne Blondel, Basic representation theory of reductive p-adic groups [1]
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• Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
  
  Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
  
  In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
  
  Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
  
  Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
  
  15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
  
  To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010