Initialize LlamaIndex for Mathematical Knowledge Base

Using LlamaIndex, set up a `VectorStoreIndex` with ChromaDB to store mathematical theorems and definitions. Write Python code to load a set of example LaTeX math documents (provided in `data/math_theorems/`) and ingest them into the index. Ensure the text splitting and embedding are optimized for mathematical expressions, potentially using a custom text splitter from LlamaIndex. Provide the necessary `llama_index` imports and ChromaDB client initialization.