14 (number)

14 (number)
14 (fourteen) is a natural number following 13 (number), 13 and succeeded by 15 (number), 15. In relation to the word "four" (4), 14 is spelled "fourteen". In mathematics * Fourteen is a composite number. * In hexadecimal, fourteen is represented as E * Fourteen is the lowest even ''n'' for which the equation φ(''x'') = ''n'' has no solution, making it the first even nontotient (see Euler's totient function). * Take a Set (mathematics), set of real numbers and apply the closure (topology), closure and complement (set theory), complement operations to it in any possible sequence. At most 14 distinct sets can be generated in this way. ** This holds even if the reals are replaced by a more general topological space. See Kuratowski's closure-complement problem * 14 is a Catalan number. * Fourteen is a Pell number, Companion Pell number. * According to the Shapiro inequality 14 is the least number n such that there exist ''x'', ''x'', ..., ''x'' such that :\sum_^ \frac < \frac
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There are many different numeral systems, that is, Writing system, writing systems for expressing numbers. By culture / time period By type of notation Numeral systems are classified here as to whether they use positional notation (also known as place-value notation), and further categorized by radix or base. Standard positional numeral systems The common names are derived Hexadecimal#Etymology, somewhat arbitrarily from a mix of Latin and Greek language, Greek, in some cases including roots from both languages within a single name. There have been some proposals for standardisation. Non-standard positional numeral systems Bijective numeration Signed-digit representation Negative bases The common names of the negative base numeral systems are formed using the prefix ''nega-'', giving names such as: Complex-base system, Complex bases Non-integer representation, Non-integer bases p-adic number, n-adic number Mixed radix * Factorial number system * Even doubl ...
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