Differences
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sum_type [2014/09/28 23:11] nikolaj |
sum_type [2015/10/07 16:50] nikolaj |
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| | @#FF8866: rule | @#FF8866: ${\large\frac{b\ :\ Y}{\nu_{\mathcal r}(b)\ :\ X+Y}}(+\mathcal r \mathcal I)$ | | | @#FF8866: rule | @#FF8866: ${\large\frac{b\ :\ Y}{\nu_{\mathcal r}(b)\ :\ X+Y}}(+\mathcal r \mathcal I)$ | | ||
| | @#FF8866: rule | @#FF8866: ${\large\frac{\Gamma,\ x\ :\ X\ \vdash\ f\ :\ Z\hspace{1cm}\Gamma,\ y\ :\ Y\ \vdash\ g\ :\ Z\hspace{1cm}c\ :\ X+Y}{\Gamma\ \vdash\ \left[\mathrm{\bf if}\,c\ \text{matches} \ \nu_{\mathcal l}(x)\ \text{do} \ f(x),\ \mathrm{\bf elseif}\, c\ \text{matches} \ \nu_{\mathcal r}(y)\ \text{do} \ g(y)\right]\ :\ Z}}(+\mathcal E)$ | | | @#FF8866: rule | @#FF8866: ${\large\frac{\Gamma,\ x\ :\ X\ \vdash\ f\ :\ Z\hspace{1cm}\Gamma,\ y\ :\ Y\ \vdash\ g\ :\ Z\hspace{1cm}c\ :\ X+Y}{\Gamma\ \vdash\ \left[\mathrm{\bf if}\,c\ \text{matches} \ \nu_{\mathcal l}(x)\ \text{do} \ f(x),\ \mathrm{\bf elseif}\, c\ \text{matches} \ \nu_{\mathcal r}(y)\ \text{do} \ g(y)\right]\ :\ Z}}(+\mathcal E)$ | | ||
| - | ==== Discussion ==== | + | |
| + | ----- | ||
| + | === Discussion === | ||
| == Notation == | == Notation == | ||
| The matching-term is generally written | The matching-term is generally written | ||
| Line 15: | Line 17: | ||
| == Logic == | == Logic == | ||
| Note how the rules reflect the logical "or". | Note how the rules reflect the logical "or". | ||
| - | ==== Parents ==== | + | |
| + | ----- | ||
| === Element of === | === Element of === | ||
| [[Type]] | [[Type]] | ||
