- Wishful thinking and making wish lists;
- Outside-the-box, or lateral thinking: "putting out fires with sound";
- Goal-oriented solving: start at the end, work backward;
- Domain analysis, problem breakdown, solution design (blueprinting);
- Look at it from real up close, look at it from ten miles away;
- search for a solution = proof search in a proof tree;
- ??? (more)
- Algebraic topology / number theory / analytic geometry:
- take a problem in topology / numbers / geometry,
- convert to algebra,
- solve the algebraic problem,
- convert back to topology / numbers / geometry.
- Laplace transform in differential equations is a perfect example.
- Many, many more examples in all areas of math and CS.
- Explain the mental models and patterns of mathematical ideas:
- structural build-up from axioms by following rules;
- the (cumulative) past determines the present;
- how abstraction works, infinite families of mathematical objects;
- what properties / predicates are and how to detect them;
- ??? (more)