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14
4a1s/MFES/PL - Aula 4.md
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@ -26,13 +26,23 @@ sig Day {}
pred inv1 {
// Every image is posted by one user.
all y: Photo | some x: User | x->y in posts
all x,y : User, z: Photo | x->z in posta
all x,y : User, z: Photo | x->z in posts and y->z in posts implies x=y
// or (equivalent to 2nd formula)
all x,y : User, z: Photo | x in posts z and y in posts z implies x=y
// or (equivalent to 1st and 2nd formula)
all y: Photo | some posts y
all y: Photo | lone posts y
// or (equivalent to 1st and 2nd formula)
all y:Photo | one posts y
}
pred inv2 {
// Users cannot follow themselves.
all x: User | x->x not in follows
}