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'''Irvian mode''' is the mode of the [[maximal evenness]] scale where the notes are symmetrically arranged.
'''Irvian mode''' is the mode of the [[maximal evenness]] scale where the notes are symmetrically arranged.


The term was proposed in 2021 by Eliora, and it is named after a calendar designer Irvin Bromberg, whose Sym454 calendar's leap year patterns are arranged in the same way.
The term was proposed in 2021 by [[Eliora]], and it is named after a calendar designer Irvin Bromberg, whose Sym454 calendar's leap year patterns are arranged in the same way.  
 
Using the [[UDP notation]], Irvian mode is defined as (N-1)/2 | (N-1)/2 if the N-EDO is odd, and two variants for even modes are either (N/2)|(N/2 - 1) or (N/2 - 1)|(N/2).  


==History==
==History==