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+/* Copyright 2018 The TensorFlow Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#ifndef TENSORFLOW_COMPILER_XLA_CLIENT_LIB_MATH_H_
+#define TENSORFLOW_COMPILER_XLA_CLIENT_LIB_MATH_H_
+
+#include "tensorflow/compiler/xla/client/xla_client/xla_builder.h"
+
+namespace xla {
+
+// Computes the square root of 'operand'.
+XlaOp Sqrt(XlaOp operand);
+
+// Computes the reciprocal of the square root of 'operand'.
+XlaOp Rsqrt(XlaOp operand);
+
+// Computes the square of 'operand'.
+XlaOp Square(XlaOp operand);
+
+// Computes the reciprocal of 'operand'.
+XlaOp Reciprocal(XlaOp operand);
+
+// Evaluates a polynomial given coefficients and `x`.
+// N.B. Coefficients should be supplied in decreasing order.
+XlaOp EvaluatePolynomial(XlaOp x,
+                         tensorflow::gtl::ArraySlice<float> coefficients);
+
+// Computes an approximation of the error function complement (1 - erf(x)).
+XlaOp Erfc(XlaOp x);
+
+// Computes an approximation of the error function.
+XlaOp Erf(XlaOp x);
+
+// Computes an approximation of the inverse of the error function.
+XlaOp ErfInv(XlaOp x);
+
+// Computes an approximation of the lgamma function.
+XlaOp Lgamma(XlaOp input);
+
+// Computes an approximation of the digamma function.
+XlaOp Digamma(XlaOp input);
+
+// Trigonometric functions
+
+// Computes the arc cosine of 'x'.
+XlaOp Acos(XlaOp x);
+
+// Computes the arc sine of 'x'.
+XlaOp Asin(XlaOp x);
+
+// Computes the arc tangent of 'x'.
+XlaOp Atan(XlaOp x);
+
+// Computes the tangent of 'x'.
+XlaOp Tan(XlaOp x);
+
+// Hyperbolic trigonometric functions
+
+// Computes the inverse hyperbolic cosine of 'x'.
+XlaOp Acosh(XlaOp x);
+
+// Computes the inverse hyperbolic sine of 'x'.
+XlaOp Asinh(XlaOp x);
+
+// Computes the inverse hyperbolic tangent of 'x'.
+XlaOp Atanh(XlaOp x);
+
+// Computes the hyperbolic cosine of 'x'.
+XlaOp Cosh(XlaOp x);
+
+// Computes the hyperbolic sine of 'x'.
+XlaOp Sinh(XlaOp x);
+
+}  // namespace xla
+
+#endif  // TENSORFLOW_COMPILER_XLA_CLIENT_LIB_MATH_H_