IDR1357 — Rationale for the Bridge Series
1.0 This page is an Unlisted Discovery
Like all ID Rationale pages, IDR1357 is intentionally Unlisted. There are no direct links to this page elsewhere on the U2D2 website. Visitors typically arrive here through a Fibonacci-encoded “Remote Tool Tip” (RTT), a shared URL, or by intentionally exploring the site’s numbering system. Or you may have even arrived here via an intermediary page called a Zeckendorf Redirect, which also utilizes Fibonacci encoding and decoding.
These hidden pages reward curiosity by providing historical, mathematical, and conceptual context for document identifiers while allowing the primary papers to remain focused on their central ideas.
2.0 What is the Bridge Series?
The Bridge Series needed to represent an unlimited number of CBAs going forward. Potentially thousands of separate cities, counties, and other local governments could use virtually the same model. It needed to accomodate nearly an unlimited number of separate categories side-to-side within the Bridge Series, but also up and down vertically. More on this below in the section
3.0 Why 1357?
The Bridge Series begins with the year 1357, which marked the start of construction of the Charles Bridge, in what is today the Czech Republic. Work began on July 9, 1357, at 5:31 a.m.—a date and time deliberately selected by Emperor Charles IV because it formed the numerical palindrome 135797531. He personally laid the cornerstone at that moment. The same year also witnessed the Great Ordinance of 1357, in which Étienne Marcel attempted to impose fiscal discipline upon the French monarchy. At first glance, these appear to be unrelated historical events: one involving the construction of a physical bridge, the other an early effort to place institutional limits upon governmental finances. The selection of 1357 is related to both historical events and is intentional.
The first conceptual bridge spans from 1357 to 1787, when the United States Constitution was drafted. These dates are separated by exactly 430 years. (More on that below.) Although separated by centuries, geography, and circumstance, they represent successive milestones in humanity’s continuing search for institutional mechanisms capable of limiting concentrated power. The Great Ordinance sought greater fiscal accountability. The U.S. Constitution established one of history’s most influential systems of constitutional checks and balances, including important limitations upon governmental monetary authority. Together they illustrate the continuing evolution of constitutional thought.
The third identifier is 2357. No historical significance can yet be attached to that year, yet the number itself possesses an unusual mathematical property. It is a prime number containing all four single-digit prime digits—2, 3, 5, and 7—in sequence. The year also lies exactly 1,000 years after 1357, symbolically extending the Bridge Series from meaningful historical milestones into the future.
An obvious mathematical structure is the numbers 1,3,5, and 7—the first four single digit odd numbers. Another mathematical structure of the series is hidden within the numerical values of the first three identifiers—1357, 1787, and 2357. The difference between 1357 and 1787 is 430. The difference between 1787 and 2357 is 570, exactly 140 greater than the previous interval. This establishes the recursive rule governing the remainder of the series: each successive interval increases by 140 over the preceding interval. The resulting sequence continues indefinitely: 1357, 1787, 2357, 3067, 3917, 4907, 6037, 7307, …
The Bridge Series therefore combines historical reference with mathematical continuity. The first three identifiers were selected because they represent meaningful historical or symbolic milestones. Every subsequent identifier is generated from a simple recursive rule, allowing the series to expand indefinitely while preserving its internal structure.
4.0 The Future ID Number Architecture of Bridge Series CBAs
Since each of these first three ID numbers in the Bridge Series represent CBAs with distinct purposes this creates a foundation for all CBAs based on those same purposes.
For example, the first CBA for HOAs will be CBA1357. The second one can be CBA1357-xxxx with xxxx being any relevant number for that community. It could be an area code, a zip code, an historic date, or whatever the HOAs in that CBA want to use. The 1357 will remain as a permanent indicator for any corresponding CBA numbers related to HOAs.
Likewise, the first municipal CBA will be CBA1787. The second will be CBA1787-xxxx for the same reason.
And again, the first national CBA will be CBA2357. The second will be CBA2357-xxxx, and so on.