filter of lines in data.frame with && boolean

General
1

hi

liste=1:100
tout <- data.frame(aa=liste,bb=sqrt(liste))
tout[abs(tout[,2]-4.5)<0.5,]```

works very fine

but why does :

liste=1:100
tout <- data.frame(aa=liste,bb=sqrt(liste))
tout[tout[,2]>4 && tout[,2]<5<0.5,]

does not ?
2

you can do

1<2

and you can do

2<3

but you cant do

1<2<3

try it ...

but you can do either of

(1<2)&(2<3)
(1<2)&&(2<3)
3

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