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MathExpr is distributed under two licenses depending on the component:

ExprTk

Free use of the C++ Mathematical Expression Toolkit Library is permitted under the guidelines and in accordance with the most current version of the MIT License.

  1. https://www.opensource.org/licenses/MIT
  2. SPDX-License-Identifier: MIT
  3. SPDX-FileCopyrightText: Copyright (C) 1999-2025 Arash Partow

MathExpr

The modification introduced by MathExpr are licensed under the Apache License, Version 2.0.

  1. https://www.apache.org/licenses/LICENSE-2.0
  2. SPDX-License-Identifier: Apache-2.0
  3. SPDX-FileCopyrightText: Copyright 2013 Google Inc.
  4. SPDX-FileCopyrightText: Copyright 2024-2026 Yuya Asano

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