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The DG focused on the relationship between CAS and mathematics in teaching and learning, educational design and the qualification of teachers’ choices concerning the use and non-use of CAS.

The 13th International Congress on Mathematical Education in Hamburg was not only a scientific experience for researchers in mathematics education from all over the world. As Convenor and Local Chair of ICME-13, we are particularly pleased that also more than 250 teachers from all over Germany and five other countries have benefited from this congress. Despite the school holidays taking place in many federal states of Germany in July, mathematics teachers could take part in a special conference for teachers taking place parallel to ICME-13 on the 27th–29th of July 2017. On three days, the teachers were able to participate in a comprehensive lecture and workshop program, which included not only professional development courses in the area from primary to secondary mathematics education, but also thematically relevant excursions.

Robots use feedback control algorithms which compute commands to the actuators based upon the error between the current state of the robot and its target state. The magnitudes of the commands can be proportional to the error, obtained by integrating or differentiating the error, or some combination of these functions. The goal is to reach the target state, to reach it quickly and to avoid instability such as oscillations. The performance of a control system depends on parameters called gains, which can be determined by experimentation.

The 13th International Congress on Mathematical Education in Hamburg was not only a scientific experience for researchers in mathematics education from all over the world. As Convenor and Local Chair of ICME-13, we are particularly pleased that also more than 250 teachers from all over Germany and five other countries have benefited from this congress. Despite the school holidays taking place in many federal states of Germany in July, mathematics teachers could take part in a special conference for teachers taking place parallel to ICME-13 on the 27th–29th of July 2017. On three days, the teachers were able to participate in a comprehensive lecture and workshop program, which included not only professional development courses in the area from primary to secondary mathematics education, but also thematically relevant excursions.

Robots use feedback control algorithms which compute commands to the actuators based upon the error between the current state of the robot and its target state. The magnitudes of the commands can be proportional to the error, obtained by integrating or differentiating the error, or some combination of these functions. The goal is to reach the target state, to reach it quickly and to avoid instability such as oscillations. The performance of a control system depends on parameters called gains, which can be determined by experimentation.

The 13th International Congress on Mathematical Education in Hamburg was not only a scientific experience for researchers in mathematics education from all over the world. As Convenor and Local Chair of ICME-13, we are particularly pleased that also more than 250 teachers from all over Germany and five other countries have benefited from this congress. Despite the school holidays taking place in many federal states of Germany in July, mathematics teachers could take part in a special conference for teachers taking place parallel to ICME-13 on the 27th–29th of July 2017. On three days, the teachers were able to participate in a comprehensive lecture and workshop program, which included not only professional development courses in the area from primary to secondary mathematics education, but also thematically relevant excursions.

Robots use feedback control algorithms which compute commands to the actuators based upon the error between the current state of the robot and its target state. The magnitudes of the commands can be proportional to the error, obtained by integrating or differentiating the error, or some combination of these functions. The goal is to reach the target state, to reach it quickly and to avoid instability such as oscillations. The performance of a control system depends on parameters called gains, which can be determined by experimentation.

The 13th International Congress on Mathematical Education in Hamburg was not only a scientific experience for researchers in mathematics education from all over the world. As Convenor and Local Chair of ICME-13, we are particularly pleased that also more than 250 teachers from all over Germany and five other countries have benefited from this congress. Despite the school holidays taking place in many federal states of Germany in July, mathematics teachers could take part in a special conference for teachers taking place parallel to ICME-13 on the 27th–29th of July 2017. On three days, the teachers were able to participate in a comprehensive lecture and workshop program, which included not only professional development courses in the area from primary to secondary mathematics education, but also thematically relevant excursions.

Robots use feedback control algorithms which compute commands to the actuators based upon the error between the current state of the robot and its target state. The magnitudes of the commands can be proportional to the error, obtained by integrating or differentiating the error, or some combination of these functions. The goal is to reach the target state, to reach it quickly and to avoid instability such as oscillations. The performance of a control system depends on parameters called gains, which can be determined by experimentation.

The segment of the ICME-13 Opening Ceremony that was dedicated to the ICMI Awards was presided over by Carolyn Kieran, Chair of the Felix Klein and Hans Freudenthal Awards Committee, and by Jeremy Kilpatrick, Chair of the Emma Castelnuovo Award Committee.