Nuprl Definition : w-when 0,22

(x when e) == s(1of(e);2of(e)).x 
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clarification:

w-when(wxe) == w-s(w; 1of(e); 2of(e); x
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Definitionss(i;t).x, 1of(t), 2of(t)
FDL editor aliasesw-when

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