(countable_image
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(countable_image-2 nil 3322415765
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(("1" (skolem!)
(("1" (inst + "f!2 o g!1" )
(("1" (assert )
(("1"
(lemma "inj_inv_alt[(S!1), (image(f!1)(S!1))]"
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(("1" (inst - "g!1(x1!1)" "g!1(x2!1)" )
(("1" (assert ) nil nil )) nil ))
nil ))
nil ))
nil ))
nil ))
nil ))
nil ))
nil )
("2" (expand * "restrict" "image" "image" )
(("2" (skolem!) (("2" (inst?) nil nil )) nil )) nil ))
nil ))
nil )
("2" (expand * "restrict" "surjective?" )
(("2" (skolem-typepred)
(("2" (expand * "image" "image" )
(("2" (skolem!)
(("2" (inst?) (("2" (assert ) nil nil )) nil )) nil ))
nil ))
nil ))
nil )
("3" (expand * "image" "image" )
(("3" (skolem!) (("3" (inst?) nil nil )) nil )) nil ))
nil ))
nil ))
nil ))
nil )
((is_countable const-decl "bool" countability nil )
(R formal-type-decl nil countable_image nil )
(image const-decl "set[R]" function_image nil )
(surjective? const-decl "bool" functions nil )
(restrict const-decl "R" restrict nil )
(surjective_inverse_exists formula-decl nil function_inverse_def
nil )
(O const-decl "T3" function_props nil )
(g!1 skolem-const-decl "[(image(f!1)(S!1)) -> (S!1)]"
countable_image nil )
(f!2 skolem-const-decl "(injective?[(S!1), nat])" countable_image
nil )
(S!1 skolem-const-decl "set[D]" countable_image nil )
(f!1 skolem-const-decl "[D -> R]" countable_image nil )
(inj_inv_alt formula-decl nil function_inverse_def nil )
(inverse? const-decl "bool" function_inverse_def nil )
(image const-decl "set[R]" function_image nil )
(injective? const-decl "bool" functions nil )
(nat nonempty-type-eq-decl nil naturalnumbers nil )
(>= const-decl "bool" reals nil )
(int nonempty-type-eq-decl nil integers nil )
(integer_pred const-decl "[rational -> boolean]" integers nil )
(rational nonempty-type-from-decl nil rationals nil )
(rational_pred const-decl "[real -> boolean]" rationals nil )
(real nonempty-type-from-decl nil reals nil )
(real_pred const-decl "[number_field -> boolean]" reals nil )
(number_field nonempty-type-from-decl nil number_fields nil )
(number_field_pred const-decl "[number -> boolean]" number_fields
nil )
(number nonempty-type-decl nil numbers nil )
(set type-eq-decl nil sets nil )
(D formal-type-decl nil countable_image nil )
(NOT const-decl "[bool -> bool]" booleans nil )
(bool nonempty-type-eq-decl nil booleans nil )
(boolean nonempty-type-decl nil booleans nil ))
nil )
(countable_image-1 nil 3313909571
("" (skosimp*)
(("" (case "is_finite(S!1)" )
(("1" (lemma "image_finite" ("X" "S!1" "f" "f!1" ))
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(("1" (expand "is_finite" )
(("1" (skosimp)
(("1" (expand "is_countable" )
(("1" (inst + "f!2" )
(("1" (expand "injective?" )
(("1" (propax) nil nil )) nil ))
nil ))
nil ))
nil ))
nil ))
nil ))
nil ))
nil )
("2" (rewrite "countable_card" -1)
(("2" (split)
(("1" (propax) nil nil )
("2" (expand "is_countably_infinite" )
(("2" (skosimp)
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(case "surjective?[(S!1),(image(f!1)(S!1))](f!1)" )
(("1" (hide 1)
(("1"
(lemma
"surjective_inverse_exists[(S!1), (image(f!1)(S!1))]"
("f" "restrict[D, ((S!1)), R](f!1)" ))
(("1" (skosimp*)
(("1" (inst + "f!2 o g!1" )
(("1"
(lemma
"inj_inv_alt[(S!1), (image(f!1)(S!1))]"
("f"
"restrict[D, ((S!1)), R](f!1)"
"g"
"g!1" ))
(("1"
(expand "bijective?" )
(("1"
(flatten)
(("1"
(hide-all-but (-1 -4 1))
(("1"
(expand "o" )
(("1"
(expand "injective?" )
(("1"
(skosimp*)
(("1"
(inst
-3
"g!1(x1!1)"
"g!1(x2!1)" )
(("1"
(assert )
(("1"
(inst - "x1!1" "x2!1" )
(("1"
(assert )
nil
nil ))
nil ))
nil ))
nil ))
nil ))
nil ))
nil ))
nil ))
nil ))
nil )
("2" (propax) nil nil ))
nil ))
nil ))
nil )
("2" (assert )
(("2" (skosimp*)
(("2" (expand "restrict" )
(("2"
(expand "image" )
(("2"
(expand "image" )
(("2" (inst + "x1!1" ) nil nil ))
nil ))
nil ))
nil ))
nil ))
nil ))
nil ))
nil )
("2" (hide-all-but 1)
(("2" (expand "restrict" )
(("2" (expand "surjective?" )
(("2" (skosimp*)
(("2" (typepred "y!1" )
(("2"
(expand "image" )
(("2"
(expand "image" )
(("2"
(skosimp*)
(("2"
(inst + "x!1" )
(("2" (assert ) nil nil ))
nil ))
nil ))
nil ))
nil ))
nil ))
nil ))
nil ))
nil ))
nil )
("3" (expand "image" )
(("3" (expand "image" )
(("3" (skosimp) (("3" (inst + "x1!1" ) nil nil ))
nil ))
nil ))
nil ))
nil ))
nil ))
nil ))
nil ))
nil ))
nil ))
nil ))
nil ))
nil )
((is_finite const-decl "bool" finite_sets nil )
(set type-eq-decl nil sets nil )
(is_countable const-decl "bool" countability nil )
(is_countably_infinite const-decl "bool" countability nil ))
shostak)))
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