Mirror of https://github.com/leanprover/lean2 in case it ever disappears
463e70332d
We say an inductive type T is reflexive if it contains at least one constructor that
takes as an argument a function returning T.
For reflexive types it doesn't seen to be possible to define a single
brec_on that can eliminate to Type.{>=1} and Prop.
The universe level expressions get too complicated.
Even if we extend the universe constraint solver in the kernel, the
additional complexity might be a problem.
We workaround this issue by defining two versions of brec_on:
- One (brec_on) that eliminates to Type.{>=1}, and
- binduction_on that eliminates to Prop.
For non-reflexive types, we can combine both of them.
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| .travis.yml | ||
| LICENSE | ||
| README.md | ||
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About
Requirements
- C++11 compatible compiler: g++ (version >= 4.8.1), or clang++ (version >= 3.3)
- CMake
- GMP (GNU multiprecision library)
- MPFR (GNU MPFR Library)
- Lua 5.2 or 5.1, or LuaJIT 2.0
- (optional) gperftools
- (optional) Boost (version >= 1.54), we can build Lean using boost::thread instead of std::thread. When using Boost, Lean can modify the thread stack size.
Installing required packages at
Windows
Linux
OS X
Build Instructions
Miscellaneous
- Testing and Code Coverage
- Building Doxygen Documentation:
doxygen src/Doxyfile - Coding Style
- Git Commit Convention
- Automatic Builds
- Syntax Highlight Lean Code in LaTeX