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I have:

$$\bigwedge_{i=1}^{9} \bigwedge_{n=1}^{9} \bigvee_{j=1}^{9}~p(i,j,n)$$

How can I write it in Wolfram Mathematica code?

I tried this way, but it does not work:

ToExpression["\\bigwedge_{i=1}^{9} \\bigwedge_{n=1}^{9} \\bigvee_{j=1}^{9}~p(i,j,n)",TeXForm]

During evaluation of In[2]:= ToExpression::esntx: Could not parse \bigwedge_{i=1}^{9} \bigwedge_{n=1}^{9} \bigvee_{j=1}^{9}~p(i,j,n) as input.

$Failed

What is the mistake in my above code?

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2 Answers 2

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5
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Well, Mathematica can only parse its own language, not $\LaTeX$. The Mathematica equivalent would be

P = Array[p, {9, 9, 9}];
Apply[And,
  Apply[And,
   Apply[Or,
    Transpose[P, {1, 3, 2}],
    {2}],
   {1}],
  {0}];
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10
  • $\begingroup$ But what about this ToExpression["input",TeXForm]? From here: reference.wolfram.com/language/tutorial/… convert TeX input to the Wolfram Language? $\endgroup$
    – vasili111
    Commented Aug 24, 2018 at 16:51
  • $\begingroup$ $\vee$ and $\wedge$ are interpreted quite differently among various mathematical subdisciplines, so Mathematica cannot assign unique meanings to them. Best is not to rely on such a way to code. See, ToExpression["\\sum_{i=1}^10 i", TeXForm] results in 0; complete nonsense. $\endgroup$
    – Henrik Schumacher
    Commented Aug 24, 2018 at 16:56
  • $\begingroup$ Do you know any good tutorial/book/etc where is explained notation that is used in proposition in my post? Currently reading discrete math book but there is no explanation of that notation. I even do not know what to search in google to find that information. I tryied to search "index notation", "array notation", "compact for of propositions" but without luck. Maybe you know? $\endgroup$
    – vasili111
    Commented Aug 24, 2018 at 17:06
  • $\begingroup$ I don't exactly know what you mean. In mathematical logic, $\wedge$ means "and" and $\vee$ stands for "or". The notations of the form $\bigvee_{i=1}^9$ and $\bigwedge_{i=1}^9$ are analogous to the sum notation $\sum_{i=1}^9$. The latter should be explained in the first chapters of any beginner's analysis textbook. $\endgroup$
    – Henrik Schumacher
    Commented Aug 24, 2018 at 17:15
  • 3
    $\begingroup$ Only single character superscripts are supported by Mathematica's TeXForm parser. Using ToExpression["\\sum_{i=1}^{10} i", TeXForm] works. $\endgroup$
    – Carl Woll
    Commented Aug 24, 2018 at 17:41
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If you want to be able to input your notation into Mathematica directly, you can define special MakeExpression rules:

MakeExpression[RowBox[{UnderoverscriptBox["\[Wedge]",u__],r_}],form_]:=Replace[
    MakeExpression[RowBox[{UnderoverscriptBox["\[Sum]",u],r}],form],
    HoldComplete[Sum[a__]]:>HoldComplete[NaryWedge[a]]
]
NaryWedge[e_, iter_] := With[{list = Table[e, iter]},
    And @@ list /; ListQ @ list
]

MakeExpression[RowBox[{UnderoverscriptBox["\[Vee]",u__],r_}],form_]:=Replace[
    MakeExpression[RowBox[{UnderoverscriptBox["\[Sum]",u],r}],form],
    HoldComplete[Sum[a__]]:>HoldComplete[NaryVee[a]]
]
NaryVee[e_, iter_] := With[{list = Table[e, iter]},
    Or @@ list /; ListQ @ list
]

For example:

enter image description here

$p(7)\lor p(8)\lor p(9)$

Now, you might like to have the vee and wedge symbols slightly larger. To do this we can introduce input auto replacement rules:

CurrentValue[EvaluationNotebook[],{InputAutoReplacements,"vv"}] = StyleBox[
    "\[Vee]",
    FontWeight->Plain,
    FontFamily->"Impact"
];
CurrentValue[EvaluationNotebook[],{InputAutoReplacements,"ww"}] = StyleBox[
    "\[Wedge]",
    FontWeight->Plain,
    FontFamily->"Impact"
];

A short animation:

enter image description here

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3
  • $\begingroup$ I pasted that code and executed. After I write ww and press Space. There appears $\bigwedge$ but the cursor is to the right side of $\bigwedge$. How can I input upper and lower part of that $\bigwedge$? $\endgroup$
    – vasili111
    Commented Sep 15, 2018 at 19:07
  • $\begingroup$ Use Ctrl-4 for underscript and Ctrl-5 to switch between under and overscript. See this tutorial for more details. $\endgroup$
    – Carl Woll
    Commented Sep 15, 2018 at 19:09
  • $\begingroup$ Very good example. It works great! Thank you. $\endgroup$
    – vasili111
    Commented Sep 15, 2018 at 19:21

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