IGCSE CAIE History: Formula & Theorem Quick Reference | IGCSE CAIE 历史：公式定理速查手册

📚 IGCSE CAIE History: Formula & Theorem Quick Reference | IGCSE CAIE 历史：公式定理速查手册

This is not a mathematics cheat sheet. In IGCSE CAIE History, ‘formulas’ mean repeatable reasoning patterns for causation, source evaluation and essay structure. They help you turn scattered factual knowledge into exam-ready analytical arguments.

这不是数学公式表。在 IGCSE CAIE 历史中，“公式”指的是因果关系、史料评估和论文结构的可复现推理框架。它们能帮你把零散的事实知识转化为符合考试要求的分析性论证。

1. The Causation Theorem | 因果推理定理

For most ‘why’ or ‘explain’ questions, use the three-layer cause formula: Long-term causes set the background, medium-term causes create the fault line, and a short-term trigger starts the event.

大多数“为什么”或“解释”类题目，使用三层原因公式：长期原因构成背景，中期原因形成断层线，短期导火索引发事件。

Example formula: Cause = Background (long-term) + Fault line (medium-term) + Spark (short-term). For the First World War: nationalism and imperialism (long-term) + alliance system and war plans (medium-term) + the assassination at Sarajevo (short-term).

示例公式：原因 = 背景（长期）+ 断层线（中期）+ 导火索（短期）。以第一次世界大战

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