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	echo "<script type='text/x-mathjax-config'>
				MathJax.Hub.Config({
				    extensions: ['tex2jax.js'],
					showMathMenu: false,
					messageStyle: 'none',
				    jax: ['input/TeX', 'output/CommonHTML'],
					TeX: {
						extensions: ['AMSmath.js','AMSsymbols.js']
					},
					tex2jax: {
						inlineMath:  [['{#','#}']],
						displayMath: [['[#','#]']],
						skipTags: ['script','noscript','style','textarea','code','a']
					},
					displayAlign: 'left',
//					displayIndent: '3em',
/*
					'HTML-CSS': {
						showMathMenu: 'false',
						styles: {
						  '.MathJax_Display' : {
							  margin: '0 0 0 0', // 13px
							  padding: '0'
							}
						}
					}
*/
				});
			</script>";

	echo "<script type='text/javascript' async 
			  src='https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js'>
			</script>";
			// ver 2.7.5 : 2018-07-20 

	function mathjax_div_wrap($abbr) {
		$right_bk = 0;
		while (($left_bk=strpos($abbr,'[#',$right_bk)) and ($right_bk=strpos($abbr,'#]',$left_bk))) {
			$left_str = substr($abbr,0,$left_bk);
			$right_str = substr($abbr,$right_bk+strlen('#]'));

			$math_word_len = $right_bk + strlen('#]') - $left_bk;
			$math_word = substr($abbr, $left_bk, $math_word_len);
			$replaced = "<div style='display:inline-block;'>".$math_word."</div>"; // ."sp={$sp},ln={$ln}"

			$abbr = $left_str . $replaced . $right_str;

			$right_bk = $left_bk + strlen($replaced);
		}
		return $abbr;
	}

?>