A summary of arguments supporting the idea that math is a language is available in Logan (2000) and a more recent discussion is available on the Web.
The discipline existed before the development of written languages.Communication in math involves making use of the processes of reading, writing, speaking, listening, and thinking as one communicates with one's self, other people, computers, books, and other aids to the storage, retrieval, and use of the collected mathematical knowledge of the world.Current precollege math education systems have substantial room for improvement in helping students learn to communicate effectively in the "language" of mathematics. Ciruit wise this amp is an almost identical copy of the Fender Champ (5C1 circuit). This model had a 10" Jensen speaker and a tube compliment of 1x6SJ7 (pre amp) 1x6V6 (power amp) 1x5Y3 (rectifier). The first model GA-5 Les Paul was introduced in 1954.This model was later upgraded to the GA1RVT with an additional tube / transformer to operate the reverb. Add a driver pedal to the front end for a little overload and wonderful sonic breakup begins to occur (especially if the amp's been powered up for an hour or two already) Also, with a removable jumper circuit, I'm able to power the 10" speaker that came in most LP Jr.'s for a little help in the volume dept.When my copy arrived, the reverb tank / FS were long gone; bought a used Dan-Echo; terrific, musical, sporty amp. 8W 1x8" Guitar Combo with Reverb and Tremolo Speakers: 1x8" Inputs: 2? I'd give this amp a ten for ten, considering that it was designed and built 50 years ago. [...] I really love the sound of both of these amps [GA-5 [(two-tone)? at full volume with high-output pickups, especially the GA-5T.For the world's most punishing players, there's only one guitar speaker line that delivers the goods night after night, tour after tour: the Electro-Voice EVM-12L.Our Buyer’s guide to vintage Fender amps explains in detail how you can date your amp by looking at serial numbers, tube charts, transformer codes, speaker codes, Fender logo, etc.It would be more accurate to say that approx 650 of each of these models were produced in ’60.Known for huge tone, gorgeous low-end, and incredible stability at extreme volumes, the EVM12L 12-inch musical instrument loudspeaker has been a favorite since its introduction in 1983.Grow in your walk with Jesus Christ, be encouraged in your faith, and build your knowledge of the Bible with One Christian radio programs.Since 1956, all Celestion chassis drivers have been stamped with a date code (2 numbers and 2 letters), denoting the exact date of manufacture.Other things to look for include chasses placed in cabinets from a different year, “doctored” tube charts, non-original control plates (usually reproductions) on silverface amps, original transformer bell ends (they have correct date codes, of course) on non-original transformers, and non-original knobs (either repro or silverface knobs on blackface amps).unusual things can be found such as the empty “Pulse Adjust” hole on the rear of early ’60 brown amps, the “middle” volume control, use of tweed style grill cloth, strange non-documented transitional circuits, and changes in tolex color including the super-rare cream colored “brown” tolex that is found on some late ’60 amps. Given that people may refer to this information seeking specific production quantities of amps they are curious about, it should be pointed out that the serial numbers apply to chassis types, and not specifically to amplifier models.