Mirror of https://github.com/leanprover/lean2 in case it ever disappears
ca632cca13
We can declare variables anywhere. So, we must also be able do declare
"universe" variables anywhere. Here is a minimal example that requires
this feature
```
-- We want A and B to be in the same universe
universe variable l
variable A : Type.{l}
variable B : Type.{l}
definition tst := A = B
```
The following doesn't work because A and B are in different universes
```
variable A : Type
variable B : Type
definition tst := A = B
```
The following works, but tst is not universe polymorphic, since l is
one *fixed* global universe
```
universe l
variable A : Type.{l}
variable B : Type.{l}
definition tst := A = B
```
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| .travis.windows.yml | ||
| .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