Abstract
We show that there are families of polynomials having small depth-two arithmetic circuits that cannot be expressed by algebraic branching programs of width two. This clarifies the complexity of the problem of computing the product of a sequence of two-by-two matrices, which arises in several settings.
Original language | English (US) |
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Pages (from-to) | 217-253 |
Number of pages | 37 |
Journal | Computational Complexity |
Volume | 25 |
Issue number | 1 |
DOIs | |
State | Published - Mar 1 2016 |
All Science Journal Classification (ASJC) codes
- Theoretical Computer Science
- General Mathematics
- Computational Theory and Mathematics
- Computational Mathematics
Keywords
- Iterated matrix multiplication
- algebraic branching programs
- arithmetic circuits