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[PVS-Help] equivalence class number

Hello everyone
could you tell me how to express the number of equivalence class is finite?

i have try the following method, but failed:

RE_Eq: JUDGEMENT ~ HAS_TYPE equivalence[T]
EqC_finite: formula is_finite(EquivClass(~))

when i prove this formula,
it was converted to
is_finite(singleton[T -> set[T]](EquivClass(~)))

why "singleton" occurs?

thanks in advance!