|
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((metric_zero formula-decl nil metric_space nil)
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(ball const-decl "set[T]" metric_space_def nil))
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(x!1 skolem-const-decl "T" metric_space nil)
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((topology? const-decl "bool" topology_prelim "topology/")
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(d formal-const-decl "metric" metric_space nil)
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(number nonempty-type-decl nil numbers nil)
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("3" (lemma "ball_centre" ("x" "y!1" "r" "R"))
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real_props nil)
(nnreal_plus_nnreal_is_nnreal application-judgement "nnreal"
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--> --------------------
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--> --------------------
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