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1. • CommentRowNumber1.
   • CommentAuthorTodd_Trimble
   • CommentTimeApr 1st 2016
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   Author: Todd_Trimble
   Format: MarkdownItexI'm trying to get a grip on which iTex commands to use to get sequent derivations to come out properly sized, in a display environment. I'm using \frac which, when used multiple times, makes characters come out tiny. The \dfrac command doesn't seem to be recognized. On my unpublished personal web, I have this (as part of a bullet point): $$\frac{\frac{X \times B \to P A\;\;\; in\; \mathbf{S}}{X \times B \nrightarrow A\;\;\; in\; Rel(\mathbf{S})}}{\frac{X \nrightarrow A \times B\;\;\; in\; Rel(\mathbf{S})}{X \to P(A \times B)\;\;\; in \; \mathbf{S}}}$$ which is totally inelegant. Ideas what I should be doing?

   I’m trying to get a grip on which iTex commands to use to get sequent derivations to come out properly sized, in a display environment. I’m using \frac which, when used multiple times, makes characters come out tiny. The \dfrac command doesn’t seem to be recognized.

   On my unpublished personal web, I have this (as part of a bullet point):

   $$\frac{\frac{X \times B \to P A\;\;\; in\; \mathbf{S}}{X \times B \nrightarrow A\;\;\; in\; Rel(\mathbf{S})}}{\frac{X \nrightarrow A \times B\;\;\; in\; Rel(\mathbf{S})}{X \to P(A \times B)\;\;\; in \; \mathbf{S}}}$$

   which is totally inelegant. Ideas what I should be doing?

2. • CommentRowNumber2.
   • CommentAuthorKarol Szumiło
   • CommentTimeApr 1st 2016
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   Author: Karol Szumiło
   Format: MarkdownItexI'm not very proficient with iTex, but how about using array with "\rowlines{solid}" option? $$ \array{\arrayopts{\rowlines{solid}} X \times B \to P A\;\;\; in\; \mathbf{S} \\ X \times B \nrightarrow A\;\;\; in\; Rel(\mathbf{S}) \\ X \nrightarrow A \times B\;\;\; in\; Rel(\mathbf{S}) \\ X \to P(A \times B)\;\;\; in \; \mathbf{S} } $$

   I’m not very proficient with iTex, but how about using array with “\rowlines{solid}” option?

   $$\array{\arrayopts{\rowlines{solid}} X \times B \to P A\;\;\; in\; \mathbf{S} \\ X \times B \nrightarrow A\;\;\; in\; Rel(\mathbf{S}) \\ X \nrightarrow A \times B\;\;\; in\; Rel(\mathbf{S}) \\ X \to P(A \times B)\;\;\; in \; \mathbf{S} }$$
3. • CommentRowNumber3.
   • CommentAuthorMike Shulman
   • CommentTimeApr 1st 2016
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   Author: Mike Shulman
   Format: MarkdownItexNice, Karol! Too bad we don't have the `mathpartir` package in iTeX...

   Nice, Karol! Too bad we don’t have the mathpartir package in iTeX…

4. • CommentRowNumber4.
   • CommentAuthorTodd_Trimble
   • CommentTimeApr 1st 2016
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   Author: Todd_Trimble
   Format: MarkdownItexThank you, Karol!! That seems to work well, and I think it will save me a lot of time. There ought to be (at some point) some examples of sequent derivations at the nLab (main), and this may be the way to go.

   Thank you, Karol!! That seems to work well, and I think it will save me a lot of time.

   There ought to be (at some point) some examples of sequent derivations at the nLab (main), and this may be the way to go.

5. • CommentRowNumber5.
   • CommentAuthorMike Shulman
   • CommentTimeApr 1st 2016
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   Author: Mike Shulman
   Format: MarkdownItexThis should be put in the [[HowTo]] as well.

   This should be put in the HowTo as well.

6. • CommentRowNumber6.
   • CommentAuthorTodd_Trimble
   • CommentTimeApr 4th 2016
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   Author: Todd_Trimble
   Format: MarkdownItexI tried to put this in the [[HowTo]]. Not too competently, I'm afraid.

   I tried to put this in the HowTo. Not too competently, I’m afraid.

7. • CommentRowNumber7.
   • CommentAuthorMike Shulman
   • CommentTimeApr 4th 2016
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   Author: Mike Shulman
   Format: MarkdownItexThanks! I indented the code for the derivation so that the numbered list would continue after it.

   Thanks! I indented the code for the derivation so that the numbered list would continue after it.