Branches of Mathematics

Pure mathematics

• Algebra
• Calculus
• Geometry
• Topology
• Trignometry
• Combinatorics
• Logic
• Number theory

Applied mathematics

• Dynamical systems and differential equations
• Mathematical physics
• Computing
• Information theory and signal processing
• Probability and statistics
• Game theory
• Operations research

Related Topics

• Electromagnetic Spectrum
• Linear Equations
• Applied Physics
• Nano Technology
• Engineering Sciences
• Mathematical Medicine
• Fluid dynamics
• Computational Mathematics
• Gamma Ray Optics
• Onfrared Optics
• Relative Velocity
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• Ammeter
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• André-Marie Ampère
• Astronomical unit
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• Atomic units
• Becquerel
• Candela
• Celsius
• Circuit breaker
• Conversion of units
• Coulomb
• David Bodanis
• Day
• Decibel
• Degree (angle)
• Dyne
• Electric charge
• Electric current
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• Electron
• Electronvolt
• Elementary charge
• Farad
• Galvanometer
• Gray (unit)
• Hectare
• Henry (unit)
• Hertz
• Hour
• Hydraulic analogy
• Josephson junction
• Joule
• Katal
• Kelvin
• Kilogram
• Litre
• Lumen (unit)
• Lux
• Magnetic constant
• Metre
• Minute
• Minute of arc
• Mole (unit)
• Natural units
• Neper
• New SI definitions
• Newton (unit)
• Ohm
• Ohm's Law
• Pascal (unit)
• PDF
• Quantum Hall effect
• Radian
• Relative uncertainty
• Second
• Second of arc
• SI
• SI base unit
• SI derived unit
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• Siemens (unit)
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• Watt balance
• Weber (unit)
• Wikipedia Link rot
• 
  

• 
  Hectare
  The hectare ( /ˈhɛktɛər/ or /ˈhɛktɑr/; symbol ha) is a metric unit of area defined as 10,000 square metres (100 m by 100 m), and primarily used in the measurement of land. In 1795, when the metric system was introduced, the 'are' was defined as being 100 square metres and the hectare ('hecto-' + 'are') was thus 100 'ares' or 1/100 km². A hectare of land is about 2.47 acres.
  When the metric system was further rationalised in 1960, resulting in the International System of Units (SI), the are was not included as a recognised unit. The hectare is one of the non-SI units accepted for use with the SI units.
  The metric system of measure was first given a legal basis in 1795 by the French Revolutionary government. The law of 18 Germinal, Year III (7 April 1795) defined five units of measure:
  Although the law defined the length of the metre, there was no practical way of accurately measuring the metre (and hence the are) until 1799 when the first standard metre was manufactured and adopted.
  The standard metre remained in the custody of successive French governments until 1875 when, under the Convention of the Metre, its supervision passed into international control under the auspices of the General Conference on Weights and Measures (GCPM). At the first meeting of the GCPM in 1889 when a new standard metre, manufactured by Johnson Matthey & Co of London was adopted, the are and hectare were automatically redefined.
  
  wn.com/Hectare
• 
  Watt
  The watt ( /ˈwɒt/ WOT; symbol: W) is a derived unit of power in the International System of Units (SI), named after the Scottish engineer James Watt (1736–1819). The unit, defined as one joule per second, measures the rate of energy conversion or transfer.
  
  
  
  
  ) is the SI derived unit of electrical resistance.
  The watt is named after the Scottish scientist James Watt for his contributions to the development of the steam engine. The unit was recognized by the Second Congress of the British Association for the Advancement of Science in 1882. The 11th General Conference on Weights and Measures in 1960 adopted it for the measurement of power into the International System of Units (SI).
  The femtowatt is equal to one quadrillionth (10⁻¹⁵) of a watt. Technologically important powers that are measured in femtowatts are typically found in reference(s) to radio and radar receivers. For example, meaningful FM tuner performance figures for sensitivity, quieting and signal-to-noise require that the RF energy applied to the antenna input be specified. These input levels are often stated in dBf (decibels referenced to 1 femtowatt). This is 0.2739 microvolt across a 75 ohm load or 0.5477 microvolt across a 300 ohm load; the specification takes into account the RF input impedance of the tuner.
  
  wn.com/Watt

• David Bodanis
  David Bodanis is a popular science writer. Originally from Chicago, he lived in France for ten years. He is now based in London.
  His first commercial success The Secret House: 24 hours in the strange & wonderful world in which we spend our nights and days established him with the literary style of "microphotography", an unusual perspective in the form of a detailed worm's-eye view of human life, featuring complex and obscure explanations of everyday phenomena.
  He continued developing this style in other books, including the successful E=mc²: A Biography of the World's Most Famous Equation and Electric Universe, winner of the Aventis Prize. He has been translated into 26 languages and featured on the cover of The Economist.
  Bodanis is also a popular conference speaker. His agency, JLA, states that his speech "highlights future trends in society, technology and the economy, with particular reference to energy and climate change."
  
  
  
  wn.com/David_Bodanis

• Escapism
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• Mr. Suit (Wire)
• Burned Out and Hollow (live)
• What It's Like to Fly (live)
• At Its Heart and at Its Head (live)
• We Bite
• Your Still Life (live)

• Remain Unadapted
• Now We Rise & We are Everywhere
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• New Urbanism
• The Old World is Behind Us
• Against Automation
• Dover & Grove
• Past Imperfect
• In Memoriam

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