Timeline for Is every non-negative test function the limit of a sequence of sums of squares of test functions?
Current License: CC BY-SA 3.0
2 events
| when toggle format | what | by | license | comment | |
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| Jan 19, 2018 at 16:28 | comment | added | Pietro Majer | Nice graph --In fact I think second derivatives only converge to zero point-wise in $\{f>0\}$ | |
| Jan 19, 2018 at 15:18 | history | answered | David E Speyer | CC BY-SA 3.0 |