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Wolf... I think TEX now knows those eight symbols you
wanted for Scott-Strachey semantics.

\yyskip
If you type ``{\≡$$\bot \sqsub \dleft x←y \dright \sqsub \top$$≡\}'' you get
$$\bot \sqsub \dleft x←y \dright \sqsub \top$$
and if you type ``{\≡$$\squnion≡↓{n=0}↑≡∞(f≡↓n \glb (g≡↓n \lub h≡↓n))$$≡\}''
you get $$\squnion↓{n=0}↑∞(f↓n \glb (g↓n \lub h↓n))$$
and if you type ``{\≡$\squnion≡↓{n=0}↑≡∞(f≡↓n \glb (g≡↓n \lub h≡↓n))$≡\}''
you get $\squnion↓{n=0}↑∞(f↓n \glb (g↓n \lub h↓n))$.

\yyskip
(I hope I haven't broken TEX in the meantime.) -- Don Knuth

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