 Spectrum - Modern 17th through 21st centuries meaning in the physical sciences: Encyclopedia - SpectrumIn most modern usages of the word spectrum, there is a unifying theme of a variety of possible cases between extremes at either end. Older usages were not necessarily on that same unifying theme, but nonetheless led to the modern ones through a sequence of events set out below. Some modern usages in mathematics evolved out of that unifying theme but may be difficult to recognize as fitting into it.
Spectrum - Origins.
Originally a spectrum was what is now called a spectre, i.e., a phantom or ...
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