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LaTeX Font Info: Checking defaults for T1/cmr/m/n on input line 30. LaTeX Font Info: ... okay on input line 30. LaTeX Font Info: Checking defaults for TS1/cmr/m/n on input line 30. LaTeX Font Info: ... okay on input line 30. LaTeX Font Info: Checking defaults for OMX/cmex/m/n on input line 30. LaTeX Font Info: ... okay on input line 30. LaTeX Font Info: Checking defaults for U/cmr/m/n on input line 30. LaTeX Font Info: ... okay on input line 30. LaTeX Font Info: External font `cmex10' loaded for size (Font) <7> on input line 31. LaTeX Font Info: External font `cmex10' loaded for size (Font) <5> on input line 31. [1 ] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] ! Undefined control sequence. l.79 \[\boldsymbol {\rho}_h = E\mathbf{c}. The control sequence at the end of the top line of your error message was never \def'ed. If you have misspelled it (e.g., `\hobx'), type `I' and the correct spelling (e.g., `I\hbox'). Otherwise just continue, and I'll forget about whatever was undefined. [15] (./_formulas.aux) *********** LaTeX2e <2024-11-01> patch level 2 L3 programming layer <2025-01-18> *********** ) Here is how much of TeX's memory you used: 1581 strings out of 473191 25843 string characters out of 5715827 420202 words of memory out of 5000000 24868 multiletter control sequences out of 15000+600000 559764 words of font info for 39 fonts, out of 8000000 for 9000 1141 hyphenation exceptions out of 8191 72i,5n,79p,224b,103s stack positions out of 10000i,1000n,20000p,200000b,200000s Output written on _formulas.dvi (15 pages, 3568 bytes).