Sign in
|
English
|
Terms of Use
Dictionary
Forum
Contacts
German
⇄
Chinese
Dutch
English
French
Italian
Japanese
Polish
Portuguese
Russian
Serbian
Spanish
Swedish
+
G
o
o
g
l
e
|
Forvo
|
+
Differentialoperator
m
This HTML5 player is not supported by your browser
math.
operator nabla
;
nabla
f
Add
|
Report an error
|
Get short URL
