This paper deals with the formal system of propositional calculus of medium logic (MP).

本文讨论了中介逻辑命题演算(MP)的形式系统。

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In a social system structure, the system includes the formal system and the informal one.

在一个社会的制度结构中，制度包括正式制度和非正式制度。

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The relation of inference between the formal system wand the formal system SW is also described.

描述了形式系统W与形式系统SW形式推理之间的关系。

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The learners follow the same curriculum of the formal system.

UNESCO: Non-Formal and Continuing Education Programme

The bottom line: There are significant problems with the distribution of food through the formal system to be sure, but most Soviet citizens are able to meet their needs through informal or black market means.

CENTERFORSECURITYPOLICY: Center for Security Policy | Jackson-Vanik: Will Bush Reward Soviet Repression Or Preserve Key Incentive For Reform?

Because the literacy programme provides an alternative and accelerated route back into the formal education system, the methodologies and approaches used are designed to equip learners with the skills they need to succeed at higher learning levels.

UNESCO: Country Profile: Brazil