The b-adic representation is a way of representing a non-negative integer using a base b. It involves expressing the integer as a sum of multiples of powers of b. For example, in base 10, the number 365 can be represented as 3*10^2 + 6*10^1 + 5*10^0. This representation allows for easy conversion between different bases and is commonly used in computer science and number theory. **

To multiply 7-adic numbers, you can use the same method as multiplying regular integers, but with carrying out the operations modulo 7 at each step. Start by multiplying the corresponding digits of the two numbers, then carry over any excess to the next digit. Repeat this process for each digit position. Remember that in the 7-adic number system, each digit can only be between 0 and 6. **

A b-adic fraction is a way of representing a real number using a base b expansion. It is similar to a decimal expansion, but instead of using base 10, it uses base b. The b-adic expansion of a number consists of a sequence of digits, each of which represents a multiple of a power of b. The expansion can be finite or infinite, and it can be used to represent both rational and irrational numbers. **

To convert recurring fractions into q-adic representation, we can use the formula for converting a recurring fraction to a q-adic number. First, we express the recurring fraction as a continued fraction. Then, we use the formula for converting a continued fraction to a q-adic number, which involves finding the convergents of the continued fraction and expressing them in terms of powers of q. This process allows us to represent the recurring fraction as a q-adic number. **

The caricature of the summit conference in Helsinki shows the leaders of the United States and Russia, Donald Trump and Vladimir Putin, sitting at a table with Trump holding a puppet string attached to Putin. This caricature is a satirical representation of the perception that Trump is under the control or influence of Putin, suggesting that Putin is pulling the strings and manipulating Trump. The image reflects the controversy and speculation surrounding the relationship between the two leaders and the potential influence of Russia on the United States. **

A symposium is a formal gathering or meeting where experts in a particular field come together to discuss and exchange ideas on a specific topic. It is often organized as a series of presentations, panel discussions, and Q&A sessions, allowing participants to share their knowledge and insights with each other. Symposia are commonly held in academic and professional settings, providing a platform for networking, collaboration, and learning within a specific discipline or industry. **

"Der Kongress tanzt" is a German phrase that translates to "The Congress Dances" in English. The phrase originated from the Congress of Vienna in 1814-1815, where European diplomats and leaders gathered to reorganize Europe after the Napoleonic Wars. The phrase is a metaphor for the diplomatic and political maneuvering that took place during the Congress, likening it to a dance where participants carefully navigated their relationships and alliances. It reflects the complex and intricate nature of international diplomacy and negotiations during this historic event. **

A convention is a formal agreement or a set of accepted norms and practices that govern behavior in a particular context or industry. It is a customary way of doing things that is widely recognized and followed by a group of people. Conventions help to establish consistency, order, and predictability in social interactions or professional settings. They can vary across different cultures, societies, or fields of study. **