# 3.5: The Atomic Nucleus

- Page ID
- 351218

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\[\begin{alignat*}{3} &[x \mapsto s]x &&= s && \\ &[x \mapsto s]y &&= y \qquad &&\text{als } y\neq x \\ &[x \mapsto s](\lambda(y)t_1) &&= \lambda(y)[x \mapsto s]t_1 \qquad &&\text{als } y \neq x \text{ en } y \not \in FV(s) \\ &[x \mapsto s](t_1 \; t_2)&&= ([x \mapsto s]t_1)\;([x \mapsto s]t_2) && \end{alignat*} \nonumber \]