[isabelle] Variable sharing


If I have two locales:

locale loc1 =
fixes x::real
assumes "x < 2"

locale loc2 =
fixes y::real
assumes "y < 3"

is there a way to define a proof goal for showing EX x. x < 2 in loc1
*and* EX x. x < y in loc2 (as one proof goal)? Does this require some
form of variable sharing?


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