pl/frap
1
0
Fork 0
mirror of https://github.com/achlipala/frap.git synced 2024-11-27 23:06:20 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Italicize a term on first use (thanks to Todd Morley for the suggestion)

Browse source
This commit is contained in:
Adam Chlipala 2024-06-06 07:52:32 -04:00
parent d9fb7fca94
commit 55d128d988
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
frap_book.tex
View file

@ -1181,7 +1181,7 @@ $$\begin{array}{rrcl}
\underline{\textrm{Variables}} & p \\ \underline{\textrm{Variables}} & p \\
\textrm{Formula} & \phi &::=& \top \mid \bot \mid \phi \land \phi \mid \phi \lor \phi \mid \underline{p \mid \phi \Rightarrow \phi} \textrm{Formula} & \phi &::=& \top \mid \bot \mid \phi \land \phi \mid \phi \lor \phi \mid \underline{p \mid \phi \Rightarrow \phi}
\end{array}$$ \end{array}$$
Note how we add propositional variables $p$, which stand for unknown truth values. Note how we add \emph{propositional variables} $p$, which stand for unknown truth values.
What is fundamentally harder about modeling implication? What is fundamentally harder about modeling implication?
We need to perform \emph{hypothetical reasoning}\index{hypothetical reasoning}, trying to prove a formula with other formulas available as known facts. We need to perform \emph{hypothetical reasoning}\index{hypothetical reasoning}, trying to prove a formula with other formulas available as known facts.