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The bottom() function ranks the time series described by the expression, and then uses that ranking to represent each time series as either the constant 1 or the constant 0: 1 is returned for each time series that is in the specified number of series at the bottom of the ranking.
A bottom is the lowest price traded or published by a financial security, commodity, or index within a particular referenced time frame. The time frame can be a year, month, or even an intraday period, but when referenced in financial media or studies, this term refers to a significant low point of interest.
Language learning that starts with basic language units like words, and then moves on to more complex structures is bottom-up. This includes methods that concentrate on grammatical and sentence structures rather than looking at meaning of texts as a whole.
Indeed there is an order of definedness, where bottom is the least defined value. Have a look at this page about denotational semantics in Haskell for a more thorough explanation.
Here is a lattice for the values of Maybe Bool taken from the wiki page. It shows that Just True is more defined than Just ⊥ which is more defined than ⊥.
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