Oscillation of a sequence (shown in blue) is the difference between the limit superior and limit inferior of the sequence. In mathematics, the oscillation of a function or a sequence is a number that quantifies how much a sequence or function varies between its extreme values as it approaches infinity or a point.
Herbert is a mild form of abuse meaning a silly, or dim-witted person. The origin of this term seems to be that it was derived from the name Herbert, which meant bright.. It was used in the very direct opposite, to mean dumb.
It's official! Urban Dictionary is a (semi-)reliable source, even used in courtrooms to define slang. Check your word-nerd snobbery at the door and memorize these 100 words from Urban Dictionary that have changed the world. Warning: some strong language ahead (NSFW). Urban Dictionary is a crowdsourced resource to learn the meaning of slang words.