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fix TPTP Syntax example in Lecture 1 #1

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fix TPTP Syntax example in Lecture 1 #1

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8 changes: 4 additions & 4 deletions docusaurus-site/docs/lectures/L1.mdx
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Expand Up @@ -44,20 +44,20 @@ in a group “<span class="purpbold">assuming</span> that $x^2=1$ for all $x$, p

```tptp
%---- 1 * x = x
fof(left identity,axiom,
fof(left_identity,axiom,
! [X] : mult(e,X) = X).
%---- i(x) * x = 1
fof(left inverse,axiom,
fof(left_inverse,axiom,
! [X] : mult(inverse(X),X) = e).
%---- (x * y) * z = x * (y * z)
fof(associativity,axiom,
! [X,Y,Z] : mult(mult(X,Y),Z) = mult(X,mult(Y,Z))).
%---- x * x = 1
fof(group of order 2,hypothesis,
fof(group_of_order_2,hypothesis,
! [X] : mult(X,X) = e).
%---- prove x * y = y * x
fof(commutativity,conjecture,
! [X] : mult(X,Y) = mult(Y,X)).
! [X, Y] : mult(X,Y) = mult(Y,X)).
```

## First-Order Logic and TPTP
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