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
• Iciam
• Intelligent Imaging Neuroscience
• Biomedical Engineering
• Neuroscience Research
• Quantum Cosmology
• Brain Research

• Ampere
• Angular frequency
• Angular velocity
• Astronomical unit
• Atomic mass unit
• Atomic units
• Becquerel
• Bus (computing)
• Candela
• Capital letter
• Cardiac cycle
• Celsius
• Cesium
• Clock rate
• Clock signal
• Conversion of units
• Coulomb
• Cycle per second
• Day
• Decibel
• Degree (angle)
• Electromagnetism
• Electronic tuner
• Electronvolt
• Energy
• Farad
• Frequency
• Frequency changer
• Front-side bus
• Gamma ray
• Giga-
• Gray (unit)
• Greek language
• Heart rate
• Hectare
• Heinrich Hertz
• Henry (unit)
• Hertz
• Hour
• HZ (disambiguation)
• Infrared
• Infrasound
• Joule
• Katal
• Kelvin
• Kilogram
• Light
• Litre
• Lower case
• Lumen (unit)
• Lux
• Megahertz (horse)
• Megahertz myth
• Metre
• MHZ (disambiguation)
• Minute
• Minute of arc
• Mole (unit)
• Molecular vibration
• Natural units
• Neper
• New SI definitions
• Newton (unit)
• Note
• Ohm
• Oscillation
• Pascal (unit)
• Photon
• Pitch (music)
• Planck constant
• Pressure
• Radian
• Radian per second
• Radio
• Radio frequency
• Radioactive decay
• Second
• Second of arc
• SI base unit
• SI derived unit
• SI prefix
• Siemens (unit)
• Sievert
• Signal bandwidth
• Sine wave
• Sinusoidal
• Sound
• Square wave
• Steradian
• Stochastic
• Symbol
• Terahertz radiation
• Tesla (unit)
• Tonne
• Ultrasound
• Ultraviolet
• Volt
• Watt
• Wave function
• Wavelength
• Weber (unit)
• 
  

• 
  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

• 
  Heinrich Hertz
  Heinrich Rudolf Hertz (22 February 1857 – 1 January 1894) was a German physicist who clarified and expanded James Clerk Maxwell's electromagnetic theory of light, which was first demonstrated by David Edward Hughes using non-rigorous trial and error procedures. Hertz is distinguished from Maxwell and Hughes because he was the first to conclusively prove the existence of electromagnetic waves by engineering instruments to transmit and receive radio pulses using experimental procedures that ruled out all other known wireless phenomena. The scientific unit of frequency — cycles per second — was named the "hertz" in his honor.
  Hertz was born in Hamburg, then a sovereign state of the German Confederation, into a prosperous and cultured Hanseatic family. His father, David Gustav Hertz, was a writer and later a senator. His mother was the former Anna Elisabeth Pfefferkorn. His paternal great-grandfather, David Wolff Hertz (1757–1822), fourth son of Benjamin Wolff Hertz, moved to Hamburg in 1793, where he made his living as a jeweller; he and his wife Schöne Hertz (1760–1834) were buried in the former Jewish cemetery in Ottensen. Their first son, Wolff Hertz (1790–1859), was chairman of the Jewish community. Hertz' paternal grandfather, Heinrich David Hertz (1797–1862), was a respected businessman, and his paternal grandmother, Betty Oppenheim, was the daughter of the banker Salomon Oppenheim, from Cologne. Hertz's father and paternal grandparents converted from Judaism to Christianity. His mother's family was Lutheran.
  
  wn.com/Heinrich_Hertz

• Begin
• Open Me
• What You Want
• Bobby
• Accelerator, Part III
• De-Pressed
• Traveling Over
• Ballad of Mary Beth
• Always on My Mind
• Same As
• Wrong Again
• The Deeper I Go

• KHZ, Part 2
• Make It Go Away
• Hear You
• Fly on the Windscreen
• When There Is Nothing
• Trance, Part 3
• Feel Me
• Accelerator, Parts 1 & 2
• Lethargic
• Anxiety Attack
• Metal
• I'm Here
• Floccipaucinihilipilification

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