This seminar is jointly organized by Amirkabir University of Technology (Tehran Polytechnic) and Iranian Mathematical Society, supported by IPM and other Institutes and universities. This Seminar will provide attendees good opportunities to meet geometers and topologists from all over the world, on both aspects of Theory and Application, to exchange ideas, and to to launch national and international collaborations on different topics in the area. The scientific program will consist of keynote lectures, short lectures, workshops, discussion panels and poster sessions. The organizing committee will provide for international participants some visa and hotel facilities and help for planning a variety of touristic events in Iran to enjoy and become familiar with warm hospitality and fascinating Iranian culture. We look forward to welcoming you and your active participation in GT8 in Tehran and wish you a very pleasure and memorable stay in Iran.