A-share teaching case: derive one quarter safely
A synthetic cumulative-to-quarter bridge shows when subtraction is valid and which original evidence must be retained.
Read process & limits →CoTrading · Cases
See how a method becomes evidence and records.
Follow the question, materials and method through results, counterevidence and the next check. Real disclosures and synthetic teaching samples are labeled separately.
The process, with its limitations
Microsoft: earnings and operating cash flow
A historical Microsoft FY2025 review with source locations, reproducible changes and limits on what the figures establish.
Read process & limits →Hong Kong teaching case: revisit an interim thesis
A synthetic interim report separates reporting currency, period and missing customer evidence during a thesis review.
Read process & limits →Four-day ETF example: execution timing matters
Reproduce a synthetic allocation, initial cost, benchmark and drawdown while keeping teaching arithmetic separate from market performance.
Read process & limits →Turn materials into a checkable task
Choose a method, inspect its inputs, outputs and failure conditions, then use it in your own AI environment.
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