#arithmetic_progression  (math) a progression in which a constant is added to each term in order to obtain the next term; "1-4-7-10-13- is the start of an arithmetic progression"
  supertype:  #patterned_advance__patternedadvance__progression  a series with a definite pattern of advance
     supertype:  #series  similar things placed in order or happening one after another; "they were investigating a series of bank robberies"
        supertype:  #ordering__order  logical or comprehensible arrangement of separate elements; "we shall consider these questions in the inverse order of their presentation"
           supertype:  #arrangement  an orderly grouping (of things or persons)
              supertype:  #group__grouping  any number of entities (members) considered as a unit
                 supertype:  pm#collection  something gathering separated things (entities/situations)
                    supertype:  pm#divisible_entity__divisibleentity  many classifications under this category are application-dependant
                       supertype:  pm#entity  something that can be "involved" in a situation
                          supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
                       supertype:  pm#divisible_thing__divisiblething
                          supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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