Floor and ceiling functions Source: For example, for floor: ⌊2.4⌋ = 2, ⌊−2.4⌋ = −3, and for ceiling: ⌈2.4⌉ = 3, and ⌈−2.4⌉ = −2. The floor of x is also called the integral part, integer part, greatest

Ernest Shackleton Source: Sir Ernest Henry Shackleton (15 February 1874 – 5 January 1922) was an Anglo-Irish Antarctic explorer who led three British expeditions to the Antarctic. He was one of the principal

Poynting vector Source: An electric dipole (oscillating here along the z-axis) results in dipole radiation, whose electric field strength (colored) and Poynting vector (arrows) are shown for its x-z plane.