Z = ->(f) {
->(x) {
f[ ->(y) { x[x][y] } ]
}[
->(x) {
f[ ->(y) { x[x][y] } ]
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A # 命題Aが真である事の宣言 | |
A -> B # 命題A->Bが真である事の宣言 | |
B? # Aが真かつA-BならばBは真 | |
#=> TRUE |
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