📚 IGCSE Cambridge Law: Quick Reference Handbook of Formulas and Principles | IGCSE Cambridge 法律：公式定理速查手册
Legal study often involves grasping foundational formulas and doctrines that underpin case analysis. This quick reference handbook distils key principles into memorable 'formulas' for criminal law, tort, contract, and the legal system itself. Mastering these logical blocks helps you construct precise answers and apply the law to problem questions with confidence.
法律学习常需掌握支撑案例分析的基础公式和原则。这本速查手册将刑法、侵权法、合同法以及法律体系中的关键原则浓缩为易记的“公式”。掌握这些逻辑模块有助于你构建精准的答案，并自信地将法律适用于问题情境。
1. Criminal Liability Formula | 刑事责任公式
Actus Reus + Mens Rea + (Absence of a Valid Defence) = Criminal Liability
The core equation of criminal law: the prosecution must prove beyond reasonable doubt that the defendant committed a guilty act (actus reus) with a guilty mind (mens rea), and that no defence applies. This tripartite formula is the starting point for any criminal analysis.
刑法的核心等式：控方必须排除合理怀疑证明被告实施了犯罪行为（actus reus），具备犯罪意图（mens rea），且无有效抗辩。这一三方公式是任何刑事分析的第一步。
In strict liability offences, the mens rea requirement is completely absent; the formula simplifies to Actus Reus + (No Requirement of Mens Rea) = Guilt. Examples include certain regulatory offences involving food safety or pollution.
在严格责任犯罪中，完全不要求犯罪意图；公式简化为 犯罪行为 + (无犯罪意图要求) = 有罪。例如涉及食品安全或污染的某些监管罪行。
2. Actus Reus: The Guilty Act | 犯罪行为：有罪行为
oluntary Physical Act + (Omission if a Duty Exists) + Prohibited Circumstance = Actus Reus
The actus reus can be a positive voluntary act, an omission where the defendant owes a legal duty (e.g., statutory duty, contractual duty, assumed responsibility, public office duty), or a 'state of affairs' case such as possession of a prohibited item. The act must be voluntary; automatism negates voluntariness.
犯罪行为可以是积极的自主行为、被告负有法律义务时的不作为（如法定义务、合同义务、自愿承担的责任、公职义务），或“事件状态”案件，例如持有违禁物品。行为必须是自主的；自动化状态否定自主性。
An omission alone does not create liability unless a duty to act is recognised, such as the duty of parents towards children (R v Gibbins and Proctor) or the duty arising from a contractual relationship (R v Pittwood).
仅有不作为不产生责任，除非存在被认可的行为义务，例如父母对子女的义务（R v Gibbins and Proctor案）或因合同关系产生的义务（R v Pittwood案）。
3. Mens Rea: The Guilty Mind | 犯罪意图：有罪心态
Intention (Direct/Oblique) OR Recklessness OR Negligence = Mens Rea
Mens rea refers to the mental element of a crime. The highest level is intention: direct intent means the defendant's aim or purpose; oblique intent applies where the consequence is virtually certain and the defendant appreciates that fact (R v Woollin). This distinction is critical in murder cases.
犯罪意图指犯罪的心理要素。最高层级是故意：直接故意指被告的目的或目标；间接故意适用于结果几乎必然发生且被告认识到该事实的情形（R v Woollin案）。这一区分在谋杀案中至关重要。
Recklessness is the conscious taking of an unjustified risk (Cunningham recklessness). Negligence, used in some offences such as gross negligence manslaughter, involves a failure to meet the standard of a reasonable person.
轻率是明知不当却冒险（Cunningham轻率）。过失，在某些犯罪中使用，例如重大过失过失杀人，涉及未能达到合理人标准。
Transferred malice preserves mens rea: if D intends to harm V1 but harms V2, the intent transfers (Latimer). The doctrine does not stretch across different crimes.
转移恶意保留犯罪意图：若被告意图伤害V1却伤害了V2，故意转移（Latimer案）。此原则不能跨不同犯罪转移。
4. Causation in Criminal Law | 刑法中的因果关系
Factual Causation ('but for' + Legal Causation (Substantial and Operating Cause) − Novus Actus Interveniens = Causation
Factual causation is established by the 'but for' test: but for the defendant's conduct, would the result have occurred? (R v White). Legal causation requires that the defendant's act be a substantial and operating cause of the harm, with no intervening act breaking the chain of causation.
事实因果关系采用“若非”检验标准：若非被告的行为，结果是否会发生？（R v White案）。法律因果关系要求被告行为是危害的实质且有效原因，且无介入行为中断因果链条。
An intervening act (novus actus interveniens) must be free, deliberate and informed, such as a third party's independent medical decision (R v Cheshire). The victim's own act will not break the chain if it was reasonably foreseeable (R v Roberts).
介入行为必须是自愿、故意且知情的，例如第三方独立的医疗决定（R v Cheshire案）。受害人的自身行为如可合理预见则不会中断因果链（R v Roberts案）。
5. Non-Fatal Offences Quick Formulas | 非致命犯罪速查公式
Assault = Act causing V to apprehend immediate unlawful force + Intention/Recklessness
Assault does not require physical contact; it is committed when the defendant intentionally or recklessly causes the victim to apprehend immediate unlawful personal violence (R v Ireland). Words alone, or even silence, can constitute an assault.
袭击不要求身体接触；当被告故意或轻率地导致受害人担心即将发生非法人身
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