Given the question: Information: - Ericsson ("Telefonaktiebolaget L. M. Ericsson") is a multinational networking and telecommunications equipment and services company headquartered in Stockholm, Sweden. The company offers services, software and infrastructure in information and communications technology (ICT) for telecommunications operators, traditional telecommunications and Internet Protocol (IP) networking equipment, mobile and fixed broadband, operations and business support services, cable television, IPTV, video systems, and an extensive services operation. Ericsson had 35% market share in the 2G/3G/4G mobile network infrastructure market in 2012. - During the 6th millennium BC, agriculture spread from the Balkans to Italy and Eastern Europe, and also from Mesopotamia to Egypt. World population was essentially stable at numbers ranging between approximately 5 and 7 million. - An island or isle is any piece of sub-continental land that is surrounded by water. Very small islands such as emergent land features on atolls can be called islets, skerries, cays or keys. An island in a river or a lake island may be called an eyot or ait, and a small island off the coast may be called a holm. A grouping of geographically or geologically related islands is called an archipelago, e.g. the Philippines. - Finland , officially the Republic of Finland, is a sovereign state in Northern Europe. A peninsula with the Gulf of Finland to the south and the Gulf of Bothnia to the west, the country has land borders with Sweden to the northwest, Norway to the north, and Russia to the east. Estonia is south of the country across the Gulf of Finland. Finland is a Nordic country situated in the geographical region of Fennoscandia, which also includes Scandinavia. Finland's population is 5.5 million (2014), staying roughly on the same level over the past two decades. The majority of the population is concentrated in the southern region. In terms of area, it is the eighth largest country in Europe and the most sparsely populated country in the European Union. - Scandinavia is a historical and cultural region in Northern Europe characterized by a common ethnocultural North Germanic heritage and mutually intelligible North Germanic languages. - A nuclear power plant or nuclear power station is a thermal power station in which the heat source is a nuclear reactor. As is typical in all conventional thermal power stations the heat is used to generate steam which drives a steam turbine connected to an electric generator which produces electricity. , the IAEA report there are 435nuclear power reactors in operation operating in 31countries. Nuclear power stations are usually considered to be base load stations, since fuel is a small part of the cost of production. Their operations and maintenance (O&M) and fuel costs are, along with hydropower stations, at the low end of the spectrum and make them suitable as base-load power suppliers. The cost of spent fuel management, however, is somewhat uncertain. - The Stockholm archipelago is the largest archipelago in Sweden, and the second-largest archipelago in the Baltic Sea (the largest being across the Baltic in Finland). - Norway (; Norwegian: (Bokmal) or (Nynorsk); Sami: "Norgga"), officially the Kingdom of Norway, is a sovereign and unitary monarchy whose territory comprises the western portion of the Scandinavian Peninsula plus the island Jan Mayen and the archipelago of Svalbard. The Antarctic Peter I Island and the sub-Antarctic Bouvet Island are dependent territories and thus not considered part of the Kingdom. Norway also lays claim to a section of Antarctica known as Queen Maud Land. Until 1814, the Kingdom included the Faroe Islands (since 1035), Greenland (1261), and Iceland (1262). It also included Shetland and Orkney until 1468. It also included the following provinces, now in Sweden: Jamtland, Harjedalen and Bohuslan. - A chain reaction is a sequence of reactions where a reactive product or by-product causes additional reactions to take place. In a chain reaction, positive feedback leads to a self-amplifying chain of events. - R1 was the first nuclear reactor of Sweden . It was a research reactor located at the Royal Institute of Technology ( KTH ) campus at Valhallavagen in central Stockholm , in the rock beneath the current - day Q buildings . The reactor was active from July 13 , 1954 to June 6 , 1970 . The reactor was dismantled , and there is nothing left of it today ; the reactor hall however still exists . The capacity of the reactor was originally 300 kW but was later increased to 1 MW . - A weapons-grade substance is one that is pure enough to be used to make a nuclear weapon or has properties that make it particularly suitable for nuclear weapons use. Plutonium and uranium in grades normally used in nuclear weapons are the most common examples. (These nuclear materials have other categorizations based on their purity.) - The Baltic Sea ( ; ) is a sea of the Atlantic Ocean, enclosed by Scandinavia, Finland, the Baltic countries, and the North European Plain. It includes the Gulf of Bothnia, the Bay of Bothnia, the Gulf of Finland, the Gulf of Riga, and the Bay of Gdask. The sea stretches from 53N to 66N latitude and from 10E to 30E longitude. A mediterranean sea of the Atlantic, with limited water exchange between the two bodies, the Baltic Sea drains through the Danish islands into the Kattegat by way of the straits of resund, the Great Belt, and the Little Belt. - Sweden, officially the Kingdom of Sweden (Swedish: ), is a Scandinavian country in Northern Europe. It borders Norway to the west and Finland to the east, and is connected to Denmark in the southwest by a bridge-tunnel across the Oresund. At , Sweden is the third-largest country in the European Union by area, with a total population of 10.0 million. Sweden consequently has a low population density of , with the highest concentration in the southern half of the country. Approximately 85% of the population lives in urban areas. - Denmark is a Scandinavian country in Europe. The southernmost and smallest of the Nordic countries, it is south-west of Sweden and south of Norway, and bordered to the south by Germany. The Kingdom of Denmark is the sovereign state that comprises Denmark proper and two autonomous constituent countries in the North Atlantic Ocean: the Faroe Islands and Greenland. Denmark has a total area of , and a population of 5.7million. The country consists of a peninsula, Jutland, and an archipelago of 443 named islands, with the largest being Zealand and Funen. The islands are characterised by flat, arable land and sandy coasts, low elevation and a temperate climate. - Kista is a district of Stockholm Municipality in Sweden. Located northwest of central Stockholm, it is divided by the Stockholm Metro blue line into a western part which is primarily a working class and middle class residential area, and an eastern part occupied by commercial ventures, mostly in the telecommunication and information technology industry. - Ecole Polytechnique (also known by the nickname "X") is a French public institution of higher education and research in Palaiseau near Paris. - Stockholm (or ) is the capital of Sweden and the most populous city in the Nordic countries; 932,917 people live in the municipality, approximately 1.5 million in the urban area, and 2.3 million in the metropolitan area. The city is spread across 14 islands on the coast in the southeast of Sweden at the mouth of Lake Malaren, by the Stockholm archipelago and the Baltic Sea. The area has been settled since the Stone Age, in the 6th millennium BC, and was founded as a city in 1252 by a Swedish statesman Birger Jarl. It is also the capital of Stockholm County. - The Fields Medal is a prize awarded to two, three, or four mathematicians under 40 years of age at the International Congress of the International Mathematical Union (IMU), a meeting that takes place every four years. The Fields Medal is sometimes viewed as the highest honor a mathematician can receive. The Fields Medal and the Abel Prize have often been described as the mathematician's "Nobel Prize". The Fields Medal differs from the Abel in view of the age restriction mentioned above. - The Stone Age was a broad prehistoric period during which stone was widely used to make implements with an edge, a point, or a percussion surface. The period lasted roughly 3.4 million years, and ended between 8700 BCE and 2000 BCE with the advent of metalworking. - Northern Europe is the northern part or region of Europe. Although no definitive borders or definition exists for the term, geographically, Northern Europe may be considered to consist approximately of all of Europe above the 52nd parallel north; which includes (from west to east) most or all of: Iceland, the Republic of Ireland, the Isle of Man, the United Kingdom, the Faroe Islands, the Netherlands, northern Germany, Denmark, Norway, Sweden, northern Poland, Finland, Estonia, Latvia, Lithuania and northwest Russia. However, narrower definitions may also be used based on other geographical factors, such as climate and ecology. Greenland, geographically a part of North America, is politically a part of the Kingdom of Denmark, and may be included depending on the definition. - The European Union (EU) is a political and economic union of member states that are located primarily in Europe. It has an area of , and an estimated population of over 510 million. The EU has developed an internal single market through a standardised system of laws that apply in all member states. EU policies aim to ensure the free movement of people, goods, services, and capital within the internal market, enact legislation in justice and home affairs, and maintain common policies on trade, agriculture, fisheries, and regional development. Within the Schengen Area, passport controls have been abolished. A monetary union was established in 1999 and came into full force in 2002, and is composed of 19 EU member states which use the euro currency. - A nuclear reactor, formerly known as an atomic pile, is a device used to initiate and control a sustained nuclear chain reaction. Nuclear reactors are used at nuclear power plants for electricity generation and in propulsion of ships. Heat from nuclear fission is passed to a working fluid (water or gas), which runs through steam turbines. These either drive a ship's propellers or turn electrical generators. Nuclear generated steam in principle can be used for industrial process heat or for district heating. Some reactors are used to produce isotopes for medical and industrial use, or for production of weapons-grade plutonium. Some are run only for research. Today there are about 450 nuclear power reactors that are used to generate electricity in about 30 countries around the world. - The Nordic countries or Nordics are a geographical and cultural region in Northern Europe and the North Atlantic, where they are most commonly known as Norden (lit., "The North"). They consist of Denmark, Finland, Iceland, Norway, and Sweden, including their associated territories (Greenland, the Faroe Islands, and the Aland Islands). - Research reactors are nuclear reactors that serve primarily as a neutron source. They are also called non-power reactors, in contrast to power reactors that are used for electricity production, heat generation, or maritime propulsion. - The neutron is a subatomic particle, symbol or , with no net electric charge and a mass slightly larger than that of a proton. Protons and neutrons, each with mass approximately one atomic mass unit, constitute the nucleus of an atom, and they are collectively referred to as nucleons. Their properties and interactions are described by nuclear physics. - In nuclear physics and nuclear chemistry, nuclear fission is either a nuclear reaction or a radioactive decay process in which the nucleus of an atom splits into smaller parts (lighter nuclei). The fission process often produces free neutrons and gamma photons, and releases a very large amount of energy even by the energetic standards of radioactive decay. - District heating (also known as heat networks or teleheating) is a system for distributing heat generated in a centralized location for residential and commercial heating requirements such as space heating and water heating. The heat is often obtained from a cogeneration plant burning fossil fuels but increasingly also biomass, although heat-only boiler stations, geothermal heating, heat pumps and central solar heating are also used, as well as nuclear power. District heating plants can provide higher efficiencies and better pollution control than localized boilers. According to some research, district heating with combined heat and power (CHPDH) is the cheapest method of cutting carbon emissions, and has one of the lowest carbon footprints of all fossil generation plants. CHPDH is being developed in Denmark as a store for renewable energy, particularly wind energy, that exceeds instantaneous grid demand via the use of heat pumps and thermal stores. - A propeller is a type of fan that transmits power by converting rotational motion into thrust. A pressure difference is produced between the forward and rear surfaces of the airfoil-shaped blade, and a fluid (such as air or water) is accelerated behind the blade. Propeller dynamics, like those of aircraft wings, can be modelled by either or both Bernoulli's principle and Newton's third law. A marine propeller of this type is sometimes colloquially known as a screw propeller or screw, however there is a different class of propellers known as cycloidal propellers - they are characterized by the higher propulsive efficiency averaging 0.72 compared to the screw propellers average of 0.6 and the ability to throw thrust in any direction at any time. Their disadvantages are higher mechanical complexity and higher cost. - Stockholm County ("Stockholms lan") is a county or "lan" (in Swedish) on the Baltic sea coast of Sweden. It borders Uppsala County and Sodermanland County. It also borders Malaren and the Baltic Sea. The city of Stockholm is the capital of Sweden. Stockholm County is divided by the historic provinces of Uppland (Roslagen) and Sodermanland (Sodertorn). More than one fifth of the Swedish population lives in the county. Stockholm County is also one of the statistical "riksomraden" (national areas) according to , Nomenclature of Territorial Units for Statistics within the EU. With more than two million inhabitants, Stockholm is the most densely populated county of Sweden. - Isotopes are variants of a particular chemical element which differ in neutron number. All isotopes of a given element have the same number of protons in each atom. The term isotope is formed from the Greek roots isos ( "equal") and topos ( "place"), meaning "the same place"; thus, the meaning behind the name is that different isotopes of a single element occupy the same position on the periodic table. - KTH Royal Institute of Technology (KTH) is a university in Stockholm, Sweden. The current King of Sweden is its High Protector. In 1827 that King of Sweden established KTH Royal Institute of Technology, modeled after Ecole Polytechnique founded by Napoleon Bonaparte in Paris, France in 1794. KTH Royal Institute of Technology has since its founding served as one of Europes key centers of innovation and intellectual talent for almost two hundred years. It does so today as well, based on both its strong research, awarded by 4 of the Great Prizes in Engineering: 2 Nobel Prizes and 2 of the two Nobel equivalent prizes in Mathematics: 1 Abel Prize and 1 Fields Medal, but also based on KTH Royal Institute of Technology being the academic driving force of the world's cell phone infrastructure development (4G/LTE) at its Kista Science City - the world's foremost telecommunications infrastructure research area, home of the market leader Ericsson Group. - A nuclear chain reaction occurs when one single nuclear reaction causes an average of one or more subsequent nuclear reactions, thus leading to the possibility of a self-propagating series of these reactions. The specific nuclear reaction may be the fission of heavy isotopes (e.g., U). The nuclear chain reaction releases several million times more energy per reaction than any chemical reaction. - A neutron source is any device that emits neutrons, irrespective of the mechanism used to produce the neutrons. Neutron source devices are used in physics, engineering, medicine, nuclear weapons, petroleum exploration, biology, chemistry and nuclear power. - The Abel Prize is a Norwegian prize awarded annually by the Government of Norway to one or more outstanding mathematicians. - Malaren, historically referred to as Lake Malar in English, is the third-largest freshwater lake in Sweden (after Vanern and Vattern). Its area is 1,140km and its greatest depth is 64 m. Malaren spans 120 kilometers from east to west. The lake drains, from south-west to north-east, into the Baltic Sea through the Sodertalje Canal, Hammarbyslussen, Karl Johansslussen and Norrstrom. The easternmost bay of Malaren, in central Stockholm, is called Riddarfjarden. The lake is located in Svealand and bounded by the provinces of Uppland, Sodermanland, Narke, and Vastmanland. The two largest islands in Malaren are Selaon (91km) and Svartsjolandet (79km). - Plutonium is a transuranic radioactive chemical element with symbol Pu and atomic number 94. It is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. The element normally exhibits six allotropes and four oxidation states. It reacts with carbon, halogens, nitrogen, silicon and hydrogen. When exposed to moist air, it forms oxides and hydrides that can expand the sample up to 70% in volume, which in turn flake off as a powder that is pyrophoric. It is radioactive and can accumulate in bones, which makes the handling of plutonium dangerous. - Biography. Early life. It is known that Birger grew up and spent his adolescence in Bjalbo, Ostergotland but the exact date of his birth remains uncertain and available historical sources are contradictory. Examinations of his mortal remains indicate that he was probably about 50 upon his death in 1266 which would indicate a birth around 1216. However, his father Magnus Minneskold is assumed to have died no later than 1210, which would lead to an assumed birth a few years earlier. Under any circumstance, he was the son of Ingrid Ylva, who according to Olaus Petri was a daughter of Sune Sik and granddaughter of King Sverker I of Sweden, which would make Birger a matrilineal member of the House of Sverker. His brothers or half-brothers Eskil, Karl, and Bengt were all born long before 1200, and it can therefore be assumed that they had another mother. He was also a nephew of the jarl Birger Brosa from the House of Bjelbo. The combination of this background proved to be of vital importance. What is the relationship between 'r1 ' and 'stockholm municipality'?
The answer is:
located in the administrative territorial entity