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# day fn (DayFn)

A BinaryFunction that assigns a PositiveRealNumber and a subclass of Months to the Days within each Month corresponding to that PositiveRealNumber. For example, (DayFn 16 August) is the Class of all sixteenth days of August. For another example, (DayFn 9 Month) would return the class of all ninth days of any month. For still another example, (DayFn 18 (MonthFn 8 (YearFn 1912))) denotes the 18th day of August 1912.

## Ontologie

SUMO / TEMPORAL-CONCEPTS

## Class(es)

 třída

inheritable relation

časová relace
 třída

inheritable relation

binární funkce

day fn

## Související termín(y)

addition fn  begin fn  density fn  division fn  edition fn  end fn  exponentiation fn  future fn  graph path fn  hour fn  immediate future fn  immediate past fn  intersection fn  interval fn  kappa fn  list concatenate fn  list order fn  log fn  max fn  maximal weighted path fn  measure fn  mereological difference fn  mereological product fn  mereological sum fn  min fn  minimal weighted path fn  minute fn  month fn  multiplication fn  past fn  periodical issue fn  recurrent time interval fn  relative complement fn  relative time fn  remainder fn  second fn  series volume fn  speed fn  subtraction fn  temporal composition fn  time interval fn  union fn  when fn  where fn  year fn  before  before or equal  cooccur  earlier  finishes  meets temporally  overlaps temporally  temporally between  temporally between or equal  time

## Typy argumentů

subclass den DayFn(kladné reálné číslo, subclass měsíc)

## Axiomy (3)

Jestliže day je instancí třídy "number of month", potom number je menší než nebo roven .
```(=>
(instance
?DAY
(DayFn ?NUMBER ?MONTH))
(lessThanOrEqualTo ?NUMBER 31))```

Jestliže day1 je instancí třídy "number1 of month" a day2 je instancí třídy "number2 of month" a "(number2-number1)" se rovná , potom day1 meets day2.
```(=>
(and
(instance
?DAY1
(DayFn ?NUMBER1 ?MONTH))
(instance
?DAY2
(DayFn ?NUMBER2 ?MONTH))
(equal
(SubtractionFn ?NUMBER2 ?NUMBER1)
1))
(meetsTemporally ?DAY1 ?DAY2))```

den je internally related to day fn.
`(relatedInternalConcept Day DayFn)`