Peadar Ó Laoghaire had fó and faoi in mathematical statements. Does anyone know if these are used in Kerry Irish? I have found fá (which, as far as I'm aware, Ó Laoghaire didn't have), but there is no work on arithmetic written in Kerry Irish such as Peadar Ó Laoghaire's Eólas ar Áireamh.

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I'm an intermediate speaker of the Corca Dhuibhne dialect of Irish and also have knowledge on the old spelling
Soir gaċ síar, fé ḋeireaḋ thíar

Ua Laoghaire writes fá in some texts, possibly just giving the historically correct word.