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    • CommentRowNumber1.
    • CommentAuthorTodd_Trimble
    • CommentTimeApr 1st 2016

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    On my unpublished personal web, I have this (as part of a bullet point):

    X×BPAinSX×BAinRel(S)XA×BinRel(S)XP(A×B)inS\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?

    • CommentRowNumber2.
    • CommentAuthorKarol Szumiło
    • CommentTimeApr 1st 2016

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

    X×BPAinS X×BAinRel(S) XA×BinRel(S) XP(A×B)inS \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} }
    • CommentRowNumber3.
    • CommentAuthorMike Shulman
    • CommentTimeApr 1st 2016

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

    • CommentRowNumber4.
    • CommentAuthorTodd_Trimble
    • CommentTimeApr 1st 2016

    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.

    • CommentRowNumber5.
    • CommentAuthorMike Shulman
    • CommentTimeApr 1st 2016

    This should be put in the HowTo as well.

    • CommentRowNumber6.
    • CommentAuthorTodd_Trimble
    • CommentTimeApr 3rd 2016

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

    • CommentRowNumber7.
    • CommentAuthorMike Shulman
    • CommentTimeApr 4th 2016

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

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