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The non-orientable genus, demigenus, or Euler genus of a connected, non-orientable closed surface is a positive integer representing the number of cross-caps attached to a sphere. Alternatively, it can be defined for a closed surface in terms of the Euler characteristic χ, via the relationship χ = 2 − k , where k is the non-orientable genus.
The pun is military slang; [4] possibly a reference to Ned Kelly, from Ned Kelly's helmet, the eye slot resembling the number 1. 2 One little duck From the resemblance of the number 2 to a duck; see also "22". Response is a single "quack." 3 Cup of tea Rhymes with "three". 4 Knock at the door
Roman numerals: for example the word "six" in the clue might be used to indicate the letters VI; The name of a chemical element may be used to signify its symbol; e.g., W for tungsten; The days of the week; e.g., TH for Thursday; Country codes; e.g., "Switzerland" can indicate the letters CH; ICAO spelling alphabet: where Mike signifies M and ...
The term four-letter word serves as a euphemism for words that are often considered profane or offensive.. The designation "four-letter" arises from the observation that many (though not all) popular or slang terms related to excretory functions, sexual activity, genitalia, blasphemies, and terms linked to Hell or damnation are incidentally four-character monosyllables.
The genus (sometimes called the demigenus or Euler genus) of a connected non-orientable closed surface is a positive integer representing the number of cross-caps attached to a sphere. Alternatively, it can be defined for a closed surface in terms of the Euler characteristic χ , via the relationship χ = 2 − g , where g is the non-orientable ...
Leonhard Euler (/ ˈ ɔɪ l ər / OY-lər; [b] German: [ˈleːɔnhaʁt ˈʔɔʏlɐ] ⓘ, Swiss Standard German: [ˈleɔnhard ˈɔʏlər]; 15 April 1707 – 18 September 1783) was a Swiss polymath, mathematician, physicist, astronomer, geographer, logician, and engineer who founded the studies of graph theory and topology and made pioneering and influential discoveries in many other branches of ...
In a 1747 letter to Jean Le Rond d'Alembert, Euler defined the natural logarithm of −1 as , a pure imaginary. [4] Euler is well known in analysis for his frequent use and development of power series: that is, the expression of functions as sums of infinitely many terms, such as = =! = (! +! +! + +!
The first English translation of the Letters were done by the Scottish minister Henry Hunter in 1795. [5] Hunter targeted the translation at British women, believing that Euler intended to educate the females through his work. [6] The translation of Hunter was based on the 1787 Paris Edition, of Marquis de Condorcet and Sylvestre François ...