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Завдання №6: Код EAN13
Довідка до коду програми CAS MAXIMA. Операції логіки або порівняння у програмі CAS MAXIMA.
Among other elements, conditions may comprise relational and logical operators as follows.
| Operation | Symbol | Type |
| less than | "<" | relational infix |
| less than or equal to | "<=" | relational infix |
| equality (syntactic) | = | relational infix |
| negation of = | # | relational infix |
| equality (value) | equal | relational function |
| negation of equal | notequal | relational function |
| greater than or equal to | >= | relational infix |
| greater than | > | relational infix |
| and | and | logical infix |
| or | or | logical infix |
| not | not | logical prefix |