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```					                                           .2

:               .1

a    b                            b   a
a   x     b        x                   b   a
[a ; b]

.2

x

[a ; b]            a≤x≤b
]a ; b[            a<x<b

]a ; b]            a<x≤b
[a ; b[                a ≤ x <b
[a ; +∞[                a≤x
]a ; +∞[                a<x
]-∞ ; b]                x≤b
]-∞ ; b[                x>b

:
+∞                                − ∞ (1

[a ;b]                  b    a                       (2
b    a                            ]b a ; [           (3

44                33
44                35

-       -                          1                                                :
.2
.3
a+b
[a ;b]                                                  -
2
[a ;b]                                 a-b            -
b- a
[a ;b]                                 -
2

45            42

.4
J   I                                       J    I
I∩J
J   I                                       J    I
J∪I

:
[-1; 3]∩]0 ; 5 ] = ]0; 3]
[-1; 3]∪]0 ; 5 ] = [-1 ;5]

45             37
45             46

-       -                 2                                                   :

```
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