text: /**
  * @license Apache-2.0
  *
  * Copyright (c) 2018 The Stdlib Authors.
  *
  * 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.
  *
  *
  * ## Notice
  *
  * The original C++ code and copyright notice are from the [Boost library]{@link http://www.boost.org/doc/libs/1_61_0/boost/math/special_functions/gamma.hpp}. The implementation has been modified for JavaScript.
  *
  * ```text
  * Copyright John Maddock 2006-7, 2013-14.
  * Copyright Paul A. Bristow 2007, 2013-14.
  * Copyright Nikhar Agrawal 2013-14.
  * Copyright Christopher Kormanyos 2013-14.
  *
  * Use, modification and distribution are subject to the
  * Boost Software License, Version 1.0. (See accompanying file
  * LICENSE or copy at http://www.boost.org/LICENSE_1_0.txt)
  * ```
  */
  
  'use strict';
  
  // MODULES //
  
  var sumSeries = require( '@stdlib/math/base/tools/sum-series' );
  var lowerIncompleteGammaSeries = require( './lower_incomplete_gamma_series.js' );
  
  
  // VARIABLES //
  
  var opts = {
  	'maxTerms': 1000
  };
  
  
  // MAIN //
  
  /**
  * Sums elements of the series expansion of the lower incomplete gamma function.
  *
  * ## Method
  *
  * -   Multiply result by `((z^a) * (e^-z) / a)` to get the full lower incomplete integral.
  * -   Divide by `tgamma(a)` to get the normalized value.
  *
  * @private
  * @param {number} a - function parameter
  * @param {number} z - function parameter
  * @param {number} initialValue - initial value of the resulting sum
  * @returns {number} sum of terms of lower gamma series
  */
  function lowerGammaSeries( a, z, initialValue ) {
  	var result;
  	var s;
  
  	initialValue = initialValue || 0.0;
  	s = lowerIncompleteGammaSeries( a, z );
  	opts.initialValue = initialValue;
  	result = sumSeries( s, opts );
  	return result;
  }
  
  
  // EXPORTS //
  
  module.exports = lowerGammaSeries;
  