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[[Fasciculus:Common Logarithms.svg|thumb|Linea rubra est logarithmus decimus; linea caerulea, logarithmus binarius; linea viridis, logarithmus naturalis]]
'''Logarithmus''' est functio <math> log_a: \mathbb R^{+}\setminus \lbrace 0 \rbrace \to \mathbb R, x \mapsto log_a (x), \ (a \in \mathbb R^{+}\setminus \lbrace 0 \rbrace) </math>, cuius valor indicat exponentem variabilis independentis ''x'' ad [[basis|basim ''a'']] potentiae, id est: <math> y=log_a(x) \Leftrightarrow a^y = x. </math>
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:log<sub>10</sub>(1000) lege: ''logarithmus decimus quantitatis mille''
* logarithmus naturalis: logarithmus ad basim numeri "e" ([[Numerus Euleri]]).
* Nota: Basis in formulis saepe omittitur; itaque logarithmus decimus scribitur ''lg'' aut ''log'', logarithmus naturalis ''ln''.
== Vide etiam ==
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