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ACM"],"published-print":{"date-parts":[[2025,8,31]]},"abstract":"<jats:p>\n            An Algebraic Circuit for a polynomial\n            <jats:inline-formula content-type=\"math\/tex\">\n              <jats:tex-math notation=\"LaTeX\" version=\"MathJax\">\\(P\\in \\mathbb {F}[x_1,\\ldots ,x_N]\\)<\/jats:tex-math>\n            <\/jats:inline-formula>\n            is a computational model for constructing the polynomial\n            <jats:italic toggle=\"yes\">P<\/jats:italic>\n            using only additions and multiplications. It is a\n            <jats:italic toggle=\"yes\">syntactic<\/jats:italic>\n            model of computation, as opposed to the Boolean Circuit model, and hence lower bounds for this model are widely expected to be easier to prove than lower bounds for Boolean circuits. Despite this, we do not have superpolynomial lower bounds against general algebraic circuits of depth 3 (except over constant-sized finite fields) and depth 4 (over fields other than\n            <jats:inline-formula content-type=\"math\/tex\">\n              <jats:tex-math notation=\"LaTeX\" version=\"MathJax\">\\(\\mathbb {F}_2\\)<\/jats:tex-math>\n            <\/jats:inline-formula>\n            ), while constant-depth Boolean circuit lower bounds have been known since the early 1980s.\n          <\/jats:p>\n          <jats:p>\n            In this article, we prove the\n            <jats:italic toggle=\"yes\">first superpolynomial lower bounds against general algebraic circuits of all constant depths<\/jats:italic>\n            over all fields of characteristic 0 (or large). We also prove the first lower bounds against\n            <jats:italic toggle=\"yes\">homogeneous<\/jats:italic>\n            algebraic circuits of constant depth over any field.\n          <\/jats:p>\n          <jats:p>\n            Our approach is surprisingly simple. We first prove superpolynomial lower bounds for constant-depth\n            <jats:italic toggle=\"yes\">Set-Multilinear<\/jats:italic>\n            circuits. While strong lower bounds were already known against such circuits, most previous lower bounds were of the form\n            <jats:italic toggle=\"yes\">f(d)<\/jats:italic>\n            \u22c5 poly(\n            <jats:italic toggle=\"yes\">N<\/jats:italic>\n            ), where\n            <jats:italic toggle=\"yes\">d<\/jats:italic>\n            denotes the degree of the polynomial. In analogy with Parameterized complexity, we call this an\n            <jats:italic toggle=\"yes\">FPT<\/jats:italic>\n            lower bound. We extend a well-known technique of Nisan and Wigderson (FOCS 1995) to prove\n            <jats:italic toggle=\"yes\">non-FPT<\/jats:italic>\n            lower bounds against constant-depth set-multilinear circuits computing the Iterated Matrix Multiplication polynomial IMM\n            <jats:sub>\n              <jats:italic toggle=\"yes\">n,d<\/jats:italic>\n            <\/jats:sub>\n            (which computes a fixed entry of the product of\n            <jats:italic toggle=\"yes\">d n \u00d7 n<\/jats:italic>\n            matrices). More precisely, we prove that any set-multilinear circuit of depth\n            <jats:italic toggle=\"yes\">\u0394<\/jats:italic>\n            computing IMM\n            <jats:sub>\n              <jats:italic toggle=\"yes\">n,d<\/jats:italic>\n            <\/jats:sub>\n            must have size at least\n            <jats:inline-formula content-type=\"math\/tex\">\n              <jats:tex-math notation=\"LaTeX\" version=\"MathJax\">\\(n^{d^{\\exp (-O(\\Delta))}}\\)<\/jats:tex-math>\n            <\/jats:inline-formula>\n            . This result holds over any field, as long as\n            <jats:italic toggle=\"yes\">d<\/jats:italic>\n            =\n            <jats:italic toggle=\"yes\">o<\/jats:italic>\n            (log\n            <jats:italic toggle=\"yes\">n<\/jats:italic>\n            ).\n          <\/jats:p>\n          <jats:p>\n            We then show how to convert any constant-depth algebraic circuit of size\n            <jats:italic toggle=\"yes\">s<\/jats:italic>\n            to a\n            <jats:italic toggle=\"yes\">constant-depth<\/jats:italic>\n            set-multilinear circuit with a blow-up in size that is exponential in\n            <jats:italic toggle=\"yes\">d<\/jats:italic>\n            but only polynomial in\n            <jats:italic toggle=\"yes\">s<\/jats:italic>\n            over fields of characteristic 0. (For depths greater than 3, previous results of this form increased the depth of the resulting circuit to \u03a9 (log\n            <jats:italic toggle=\"yes\">s<\/jats:italic>\n            ).) This implies our constant-depth circuit lower bounds.\n          <\/jats:p>\n          <jats:p>\n            We can also use these lower bounds to prove a Depth Hierarchy theorem for constant-depth circuits. We show that for every depth\n            <jats:italic toggle=\"yes\">\u0393<\/jats:italic>\n            , there is an explicit polynomial which can be computed by a depth\n            <jats:italic toggle=\"yes\">\u0393<\/jats:italic>\n            circuit of size\n            <jats:italic toggle=\"yes\">s<\/jats:italic>\n            , but requires circuits of size\n            <jats:italic toggle=\"yes\">s<\/jats:italic>\n            <jats:sup>\u03c9 (1)<\/jats:sup>\n            if the depth is \u0393 -1.\n          <\/jats:p>\n          <jats:p>Finally, we observe that our superpolynomial lower bound for constant-depth circuits implies the first deterministic sub-exponential time algorithm for solving the Polynomial Identity Testing (PIT) problem for all small depth circuits using the known connection between algebraic hardness and randomness.<\/jats:p>","DOI":"10.1145\/3734215","type":"journal-article","created":{"date-parts":[[2025,6,2]],"date-time":"2025-06-02T07:08:33Z","timestamp":1748848113000},"page":"1-35","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":4,"title":["Superpolynomial Lower Bounds Against Low-Depth Algebraic Circuits"],"prefix":"10.1145","volume":"72","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0238-1674","authenticated-orcid":false,"given":"Nutan","family":"Limaye","sequence":"first","affiliation":[{"name":"Computer Science, IT-Universitet i K\u00f8benhavn","place":["Kobenhavn, Denmark"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6491-124X","authenticated-orcid":false,"given":"Srikanth","family":"Srinivasan","sequence":"additional","affiliation":[{"name":"Computer Science, K\u00f8benhavns Universitet","place":["Copenhagen, Denmark"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0025-0005","authenticated-orcid":false,"given":"S\u00e9bastien","family":"Tavenas","sequence":"additional","affiliation":[{"name":"CNRS, LAMA, Universit\u00e9 Savoie Mont Blanc","place":["Chamb\u00e9ry, France"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"320","published-online":{"date-parts":[[2025,7,24]]},"reference":[{"key":"e_1_3_4_2_2","doi-asserted-by":"publisher","DOI":"10.1016\/0168-0072(83)90038-6"},{"key":"e_1_3_4_3_2","first-page":"389","volume-title":"Proceedings of the STOC","author":"Andrews Robert","year":"2022","unstructured":"Robert Andrews and Michael A. 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