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Regulations of the 46th International Mathematical Olympiad


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  1. General

    1.1 The 46th International Mathematical Olympiad (the "IMO 2005") will be held in Mérida, Yucatán, México from July 8 th – 19 th , 2005.

1.2 These regulations (the "Regulations") govern the running of the IMO 2005.

1.3 The IMO 2005 MEXICO is a committee established by the Mexican Mathematical Olympiad and Mexican Mathematical Society, which has overall responsibility for the organization of the IMO 2005.

1.4 The general goals of the IMO 2005 are:

    1.4.1 To discover, encourage and challenge mathematically gifted young people from all countries;

    1.4.2 To foster friendly international relationships among mathematicians from all countries;

    1.4.3 To create an opportunity for the exchange of information on school syllabuses and practices throughout the world;

    1.4.4 To promote mathematics generally.


  1. Participation

2.1 Participation in the IMO 2005 is by invitation only. Each invited country is entitled to send a team consisting of up to six contestants (the "Contestants"), a Leader and a Deputy Leader to be known collectively as the participants (the "Participants").

2.2 Contestants should not have formally enrolled at a university or any other equivalent post-secondary institution, and they must have been born on or after July 14 th , 1985 .

2.3 Observers, including family members, (the "Observers") may apply to accompany the Participants, under the terms detailed in sub-clause 3.2.5 .

2.4 The official program (the "Official Program"), as referred to below, is the program and outline itinerary for the IMO 2005 and associated events, that will be marked "Official Program". The IMO 2005 Organizing Committee reserves the right to amend or revise the Official Program in whole or part. If there is by any chance a significant change, Participants, Observers, and Ministry officials from the invited countries will be notified in advance.

2.4.1   The Official Program will include details regarding accommodations (inclusive of food) for Participants, Contestants and Observers A and B at contracted hotels, the main site and the venues for various official events associated with the IMO 2005, including the opening and closing ceremonies, banquet and examination rooms. In order to maintain the integrity of the IMO 2005, the Final Official Program will not be confirmed until arrival.

2.4.2   The Official Program for Leaders and Observers A, begins in Mérida, Yucatán, on July 8 th , 2005 and ends on July 19 th, 2005.

2.4.3   The Official Program for Deputy Leaders, the Contestants and Observers B, begins in Mérida, Yucatán, on July 11th, 2005 and ends on July 19th, 2005.

2.4.4   Each invited country wishing to participate in the IMO 2005 must confirm participation by completing and returning the Registration Form, found on the Official IMO 2005 MÉXICO web site. The form must first be duly completed online, then printed and signed by the Leader, and returned to the Organizing Committee by air mail or fax no later than May 1 st, 2005, as stated in the Registration letter. This will also confirm that the Leader agrees to abide by the Regulations for the IMO 2005. Once the registration form has been filled out, notification must be sent to the Official IMO 2005 E-mail address at: IMO2005Logistics@yahoo.com, to confirm the registration process.

2.4.5   Leaders and Deputy Leaders are responsible for the conduct of the Contestants, acting in loco parentis for their Contestants, except where the Organizing Committee has been notified in writing that an Observer has been nominated to act in loco parentis.

2.4.6   Leaders and Deputy Leaders must ensure that their Contestants fully understand the Contest Regulations, Clause 5. They must also make it clear to the Contestants that violation of any of these Regulations may be cause for disqualification from the IMO 2005. Leaders and Deputy Leaders must also fully inform their Contestants of the contents of the "Guide to México" and "Important Contest Information for Contestants”.


  1. Responsibility for Accommodation and Expenses

3.1   The Organizing Committee will provide accommodation, meals, land based transport between Mérida Airport and the accommodation site, as well as other necessary transport between the official IMO 2005 accommodation and other venues on the Official Program for all the Participants and Observers.

3.2   Other than in respect to the provision of accommodation, meals and transport, as detailed in sub-clause 3.1 and the Official Program, the Organizing Committee shall not be liable under any circumstances for any additional expenses whatsoever incurred by any Participant, Contestant or Observer in connection with the IMO 2005:

3.2.1   outside the official IMO 2005 dates mentioned in the IMO 2005 Regulations, or;

3.2.2   regarding transportation to and from México (or within México prior to arrival at the Mérida Airport and following departure) incurred by Participants, Contestants or Observers.

3.2.3   All Participants, Contestants and Observers must have full accident, health and travel insurance prior to arriving in México. It is the Leader's responsibility to confirm that this condition has been met for all members of his or her team.

3.2.4   The Organizing Committee expects to offer opportunities to Participants, Contestants and Observers for excursions and cultural trips, but will be under no obligation to do so (Programmed tours).

3.2.5   In reference to sub-clause 2.3 , the deadline for receipt of applications from Observers is May 1 st , 2005 . Accommodation is limited; therefore, no guarantee will be given that applications will be accepted. All accepted applicants must make full payment with cleared funds for the following charges by June 1 st , 2005 . Once accepted, no refunds are allowed.   Observer A: Two thousand, two hundred US dollars ($2200) for a shared bedroom, or two thousand, five hundred US dollars ($2500) for a non-shared bedroom per person accompanying the Leaders and residing in each case at the Leader's site from July 8 th – 19 th , 2005;   Observer B: One thousand eight hundred US dollars ($1800) for a shared bedroom or two thousand US dollars ($2000) for a non-shared bedroom per person in each case accompanying the Deputy Leaders and residing at the Deputy Leaders sites from July 11 th – 19 th , 2005.   Costs include accommodation, meals, land-based transport between the Mérida Airport and the accommodation site, as well as other necessary transport between the official IMO 2005 accommodation and venues on the Official Program during the Official Program Dates.   Costs for additional nights spent in Mérida before or after the Official IMO 2005 Program Dates for Participants, Contestants and Observers are: One hundred and ten US dollars ($110) per night per person in shared bedrooms; and One hundred and forty US dollars ($140) in non-shared bedrooms, includes buffet breakfast.

3.2.6   Consideration will be given to applications from Observers wishing to attend and observe the IMO 2005 for only part of the period of the Official Program, and in such cases the charges, accommodations, and all other relevant arrangements that will apply, will be those separately confirmed by the Organizing Committee.


  1. Proposals for Problems

4.1   Each participating country, other than the host country, is expected to submit up to six proposed problems, with solutions, to be received by the Problem Selection Committee no later than May 14 th , 2005 . The proposals should be sent by airmail, and not by e-mail, for security reasons, as stated in the letter from the Head of the Problem Selection Committee.

4.2   The proposals should, as far as possible, cover various fields of pre-university mathematics and be of varying degrees of difficulty.

4.3   The proposals must only be written in English, French, German, Russian or Spanish. The proposals and solutions should be accompanied by their English versions.


  1. Contest Regulations

5.1   The contest element of the IMO 2005 will take place in Mérida, Yucatán, on July 13 th and 14 th , 2005 (the "Contest"), under the direction of the Chief Invigilator appointed by the Organizing Committee. On each day of the Contest, the examination will start in the morning and last for four and a half hours. Each of the two examination papers will consist of three problems.

5.2   The problems will be given to each Contestant in his/her own language. Upon request, a Contestant may receive the problems in one other language, provided that the Jury (as defined in 6.5.3) has approved the relevant translation.

5.3   Each Contestant must work independently and submit solutions in his/her own language. The solutions must be written on answer forms provided by the Organizing Committee. Contestants must write on only one side of each answer form.

5.4   The only instruments permitted in the Contest will be writing and drawing instruments, such as rulers and compasses. In particular, books, papers, tables, calculators, protractors, computers and communication devices will not be allowed into the examination room.

5.5   The Jury, Observers and any others who have sight of the problems and solutions before the examinations shall do their utmost to ensure that no Contestant has information, direct or indirect, about any proposed problem. They must also ensure that all Contest problems and solutions are kept strictly confidential until after the entire Contest has finished. They will be barred, except for the case of emergency, from having any external communication with Contestants, Deputy Leaders (and accompanying Observers) until the time of the conclusion of the examination. The Organizing Committee will provide proper assistance in case of an emergency.

5.6   The total number of prizes will not be more than half the total number of Contestants. The numbers of first, second and third prizes will be approximately in the ratio 1:2:3.

5.7   Special prizes may be awarded for solutions considered outstanding by the Jury.

5.8   The prizes will be awarded at the Closing Ceremony. Each Contestant, who has not received first, second or third prize, will receive a Certificate of Honorable Mention if he/she has received seven points for at least one solution.

5.9   Each Contestant shall receive a Certificate of Participation.


  1. Jury Regulations

6.1   The "Jury" will consist of all Leaders, together with a Chairman. A Leader may be replaced by his/her Deputy Leader in an emergency (subject to prior approval and consent of the Chairman of the Jury). Members of the IMO Advisory Board who are not already members of the Jury, members of the Problem Selection Committee and the Chief Coordinator (as defined in Clause 7 below), may also attend meetings of the Jury as observers. Observers may attend meetings of the Jury only with the permission of the Chairman of the Jury, but will not be entitled to speak or vote. However, they may exceptionally speak at the explicit request of the Chairman of the Jury. Deputy Leaders may attend, as observers, meetings of the Jury held after the Contest.

6.2   Only Leaders may vote in the decisions of the Jury and each Leader will have one vote. A motion shall be carried by a simple majority of those voting. In the event of a tie, the Chairman will have a casting vote.

6.3   The Jury may appoint sub-committees to consider specific matters.

6.4   The meetings of the Jury will be conducted principally in English. The Chairman should request a translation into some of the official languages (French, German, Russian, and Spanish) as needed.

6.5   Before the Contest the Jury will:

6.5.1   verify that all Contestants comply with the prescribed conditions for participation;

6.5.2   select the Contest problems from the submitted proposals on the basis of a preliminary selection made by the Problem Selection Committee appointed by the Organizing Committee;

6.5.3   prepare and approve the official versions of the Contest problems in English, French, German, Russian and Spanish;

6.5.4   approve the translations of the Contest problems into all required languages.

6.6   On each day of the Contest, the Jury will consider written questions raised by Contestants during the first half-hour of the Contest and decide on replies.

6.7   After the Contest, the Jury will:

6.7.1   receive and approve a report made by the Chief Invigilator on the conduct of the examinations;

6.7.2   receive a report from the Chief Coordinator on any unresolved disputes which may have arisen during coordination and determine the appropriate scores;

6.7.3  approve the scores of all Contestants;

6.7.4   decide winners of first, second and third prizes;

6.7.5   consider and decide on all proposals to award special prizes.

6.7.6   consider matters raised about future International Mathematical Olympiads.

6.8   Any allegation or suspicion of a violation of the Regulations shall be reported to the Chairman of the Jury, who will determine if there is a prima facie, and the necessity to form a committee to investigate further. The committee will report its findings to the Jury, which will decide if a violation has occurred and, if so, what sanction, if any, to apply. Possible sanctions include the disqualification of an individual Contestant or an entire team from the competition. The decision of the Jury will be final.


  1. Coordination

7.1   Each problem will be allocated a score out of a maximum of seven points.

7.2   Prior to coordination, Contestants' solutions will be assessed by Leaders and Deputy Leaders in accordance with the marking schemes prepared under the direction of the Chief Coordinator and approved by the Jury.

7.3   Each coordination session will involve two Coordinators provided by México and representatives of the relevant country. Two representatives, normally the Leader and Deputy Leader, are permitted to participate actively in any one session. With the approval of the Chief Coordinator, one further representative may be present to observe the coordination process, but cannot take any active part in it.

7.4   The Leader and the designated Coordinators should agree on the scores for each Contestant. These scores will be recorded on official forms and signed by the Leader and the Coordinators. If the Leader and the Coordinators fail to agree on a score for a Contestant, the matter will first be referred to the head Coordinator for that problem. If there is still no agreement, the matter will be referred to the Chief Coordinator. If the Leader and Chief Coordinator then fail to agree on a score, the Chief Coordinator will report the matter to the Jury with a recommendation as to what the score should be. The Jury will then determine the score.

7.5   If, during a coordination session, the designated Coordinators consider that an irregularity may have occurred, they will immediately refer the matter to the Chief Coordinator. Unless he is satisfied that there is no case to answer, he will report the situation to the Chairman of the Jury.

7.6   Solutions for each problem by Mexican Contestants will be coordinated by the Leader and Deputy Leader of the country that submitted the problem, with the assistance of the head Coordinator for that problem if required.


  1. Entire Agreement and Understanding

The Leaders, Deputy Leaders and Contestants acknowledge that these Regulations and the documents referred to herein, constitute their entire agreement and understanding of the parties and supersede any previous discussions or representations made by or on the behalf of the Organizing Committee.


  1. Force Majeure

9.1   In these Regulations, "force majeure" shall refer to any cause preventing the Organizing Committee from performing any or all of its obligations which arises from or is attributable to acts, events, omissions or accidents beyond the reasonable control of the party so prevented including without limitation strikes, lock-outs or other industrial disputes (whether involving the workforce of the party so prevented or of any other party), act of God, war, riot, civil commotion, malicious damage, compliance with any law or governmental order, rule, regulation or direction, accident, breakdown of plant or machinery, earthquake, typhoon, fire, flood, storm, or default of suppliers or sub-contractors.

9.2   If the Organizing Committee is prevented or delayed in the performance of any of its obligations to Leaders, Deputy Leaders and Contestants under these Regulations by force majeure it will have no liability in respect of the performance of such of its obligations as are prevented by the force majeure events during the continuation of such events, and for such time after they cease as is necessary for the Organizing Committee to recommence its affected operations in order for it to perform its obligations.


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