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 [2] [3]
! Misplaced alignment tab character &.
l.212 $$\Vis_i(\Sha(A)) &
                         = \Ker(\Sha(A)\to \Sha(B)).$$
I can't figure out why you would want to use a tab mark
here. If you just want an ampersand, the remedy is
simple: Just type `I\&' now. But if some right brace
up above has ended a previous alignment prematurely,
you're probably due for more error messages, and you
might try typing `S' now just to see what is salvageable.

LaTeX Font Info:    Font shape `OMS/cmr/m/it' in size <10.95> not available
(Font)              Font shape `OMS/cmsy/m/n' tried instead on input line 246.
<xymatrix 2x2 86> [4] [5]
LaTeX Font Info:    Try loading font information for U+euf on input line 353.
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File: ueuf.fd 2002/01/19 v2.2g AMS font definitions
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[6] [7] [8] [9] (./visibility.aux) ) 
Here is how much of TeX's memory you used:
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 18234 words of font info for 72 fonts, out of 500000 for 1000
 14 hyphenation exceptions out of 1000
 31i,13n,24p,1207b,484s stack positions out of 1500i,500n,5000p,200000b,5000s

Output written on visibility.dvi (9 pages, 53440 bytes).