Namespaces
Variants
Actions

Difference between revisions of "Additive arithmetic function"

From Encyclopedia of Mathematics
Jump to: navigation, search
(References: Tenenbaum (1995))
 
(One intermediate revision by one other user not shown)
Line 1: Line 1:
{{TEX|done}}
+
{{TEX|done}}{{MSC|11A25}}
 +
 
 
An [[arithmetic function]] of one argument that satisfies the following conditions for two relatively prime integers $m,n$
 
An [[arithmetic function]] of one argument that satisfies the following conditions for two relatively prime integers $m,n$
  
Line 15: Line 16:
  
 
====References====
 
====References====
* Gérald Tenenbaum; Introduction to Analytic and Probabilistic Number Theory, ser. Cambridge studies in advanced mathematics '''46''' , Cambridge University Press (1995) ISBN 0-521-41261-7
+
* Gérald Tenenbaum; Introduction to Analytic and Probabilistic Number Theory, ser. Cambridge studies in advanced mathematics '''46''' , Cambridge University Press (1995) {{ISBN|0-521-41261-7}}
 
 
[[Category:Number theory]]
 

Latest revision as of 05:52, 15 April 2023

2020 Mathematics Subject Classification: Primary: 11A25 [MSN][ZBL]

An arithmetic function of one argument that satisfies the following conditions for two relatively prime integers $m,n$

$$ f(mn) = f(m) + f(n) \ . $$

An additive arithmetic function is said to be strongly additive if $f(p^a) = f(p)$ for all prime numbers $p$ and all positive integers $a \ge 1$. An additive arithmetic function is said to be completely additive if the condition $f(mn) = f(m) + f(n)$ is also satisfied for relatively non-coprime integers $m,n$ as well; in such a case $f(p^a) = a f(p)$.

Examples. The function $\Omega(n)$, which is the number of all prime divisors of the number $n$ (multiple prime divisors being counted according to their multiplicity), is an additive arithmetic function; the function $\omega(n)$, which is the number of distinct prime divisors of the number $n$, is strongly additive; and the function $\log m$ is completely additive.


Comments

An arithmetic function is also called a number-theoretic function.

If $f(n)$ is additive then $k^{f(n)}$, for constant $k$, is a multiplicative arithmetic function.

References

  • Gérald Tenenbaum; Introduction to Analytic and Probabilistic Number Theory, ser. Cambridge studies in advanced mathematics 46 , Cambridge University Press (1995) ISBN 0-521-41261-7
How to Cite This Entry:
Additive arithmetic function. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Additive_arithmetic_function&oldid=35716
This article was adapted from an original article by I.P. Kubilyus (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article