(Greek: 'ηστοτησ = "fixed")
Invariant framework notes of the tetrachord or of the entire Perfect Immutable System.
The hestotes form the boundaries of the tetrachords, and are defined as pythagorean ratios as follows (the diagram includes the modern letter-name equivalents):
+------------ GPS -------------------+ +--------------- LPS -------------+
tetrachord ratio boundary notes boundary notes ratio tetrachord
2/1 a' nete hyperbolaion
/
hyperbolaion
\
3/2 e nete diezeugmenon
/
diezeugmenon nete synemmenon d 4/3
\ \
9/8 b paramese synemmenon
[disjunction]< /
1/1 a mese mese a 1/1
/ \
meson meson
\ /
3/4 E hypate meson hypate meson E 3/4
/ \
hypaton hypaton
\ /
9/4 B hypate hypaton hypate hypaton B 9/4
[disjunction]< >[disjunction]
1/2 A proslambanomenos proslambanomenos A 1/2
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