Changes

Line 7,996: Line 7,996:  
<p><math>\operatorname{d}^2 f = </math></p>
 
<p><math>\operatorname{d}^2 f = </math></p>
 
<p><math>\partial_{xy} f \cdot \operatorname{d}x\ \operatorname{d}y</math></p>
 
<p><math>\partial_{xy} f \cdot \operatorname{d}x\ \operatorname{d}y</math></p>
| <math>df|_{x\ y}\!</math>
+
| <math>\operatorname{d}f|_{x\ y}\!</math>
| <math>df|_{x\ (y)}\!</math>
+
| <math>\operatorname{d}f|_{x\ (y)}\!</math>
| <math>df|_{(x)\ y}\!</math>
+
| <math>\operatorname{d}f|_{(x)\ y}\!</math>
| <math>df|_{(x)(y)}\!</math>
+
| <math>\operatorname{d}f|_{(x)(y)}\!</math>
 
|-
 
|-
 
| <math>f_0\!</math>
 
| <math>f_0\!</math>
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