| Introduction to the Calculus of Variations Recent countries visiting this post |  |
 | 79 | United States |
 | 26 | |
 | 9 | China |
 | 5 | Germany |
 | 3 | France |
 | 3 | United Kingdom |
 | 2 | Czech Republic |
 | 1 | Europe |
 | 1 | Russian Federation |
 | 1 | Australia |
 | 1 | Trinidad and Tobago |
 | 1 | Italy |
 | 1 | India |
 | 1 | Canada |
| Introduction to the Calculus of Variations Recent countries visiting this post | |
| 79 | United States |
| 26 | |
| 9 | China |
| 5 | Germany |
| 3 | France |
| 3 | United Kingdom |
| 2 | Czech Republic |
| 1 | Europe |
| 1 | Russian Federation |
| 1 | Australia |
| 1 | Trinidad and Tobago |
| 1 | Italy |
| 1 | India |
| 1 | Canada |